[wam][cef] Add the CEF recipe

This change makes it possible to build applications that depend on
libcef, and also adds a few changes picked from our previous
implementation that enables the applications to communicate with the
agl-compositor.

Bug-AGL: SPEC-3872

Signed-off-by: Roger Zanoni <rzanoni@igalia.com>
Change-Id: I215138b8f5d63da84ada2f8c006f4025f0b3fafb

1 files changed, 1379 insertions, 0 deletions

diff --git a/recipes-wam/cef/files/chromium/0006-Add-webos-agl-waylandwindow-window-tree-host-essenti.patch b/recipes-wam/cef/files/chromium/0006-Add-webos-agl-waylandwindow-window-tree-host-essenti.patch
new file mode 100644
index 000000000..5ea8b83eb
--- /dev/null
+++ b/recipes-wam/cef/files/chromium/0006-Add-webos-agl-waylandwindow-window-tree-host-essenti.patch
@@ -0,0 +1,1379 @@
+From a99977eb329ca0e114ad13ce31acc6ed38bb6a7b Mon Sep 17 00:00:00 2001
+From: Roger Zanoni <rzanoni@igalia.com>
+Date: Wed, 17 May 2023 21:25:53 +0200
+Subject: [PATCH 6/9] Add webos/agl waylandwindow/window tree host essential
+ parts
+
+---
+ ui/aura/BUILD.gn                              |  7 ++
+ ui/aura/agl/window_tree_host_agl.h            | 42 +++++++++
+ ui/aura/agl/window_tree_host_platform_agl.cc  | 50 +++++++++++
+ ui/aura/agl/window_tree_host_platform_agl.h   | 51 +++++++++++
+ ui/aura/window_tree_host.h                    |  5 +-
+ ui/aura/window_tree_host_platform.cc          |  4 +-
+ ui/aura/window_tree_host_platform.h           |  4 +-
+ ui/ozone/platform/wayland/BUILD.gn            |  1 -
+ .../platform/wayland/extensions/agl/BUILD.gn  |  2 +
+ .../agl/host/wayland_extensions_agl.h         | 10 ++-
+ .../agl/host/wayland_extensions_agl_impl.cc   | 11 ++-
+ .../agl/host/wayland_extensions_agl_impl.h    |  9 ++
+ .../extensions/agl/host/wayland_window_agl.cc | 86 +++++++++++++++++++
+ .../extensions/agl/host/wayland_window_agl.h  | 49 +++++++++++
+ .../wayland/gpu/gl_surface_wayland.cc         | 10 ++-
+ .../host/gtk_primary_selection_device.cc      |  2 +-
+ .../gtk_primary_selection_device_manager.cc   |  4 +-
+ .../wayland/host/proxy/wayland_proxy_impl.cc  |  2 +-
+ .../wayland/host/wayland_connection.cc        | 23 ++++-
+ .../wayland/host/wayland_connection.h         |  9 +-
+ .../platform/wayland/host/wayland_cursor.cc   |  4 +-
+ .../wayland/host/wayland_data_device.cc       | 10 +--
+ .../wayland/host/wayland_data_device_base.cc  |  2 +-
+ .../host/wayland_data_drag_controller.cc      |  2 +-
+ .../wayland/host/wayland_data_source.cc       |  6 +-
+ ui/ozone/platform/wayland/host/wayland_drm.cc |  6 +-
+ .../wayland/host/wayland_extensions.h         |  6 ++
+ .../platform/wayland/host/wayland_keyboard.cc |  4 +-
+ .../platform/wayland/host/wayland_popup.cc    |  4 +-
+ ui/ozone/platform/wayland/host/wayland_shm.cc |  2 +-
+ .../platform/wayland/host/wayland_surface.cc  |  2 +-
+ .../wayland/host/wayland_toplevel_window.cc   | 14 +--
+ .../platform/wayland/host/wayland_window.cc   | 14 +--
+ .../platform/wayland/host/wayland_window.h    |  2 +
+ .../host/wayland_window_drag_controller.cc    |  2 +-
+ .../wayland/host/wayland_window_factory.cc    | 15 ++++
+ .../wayland/host/wayland_zwp_linux_dmabuf.cc  |  4 +-
+ .../wayland/host/xdg_foreign_wrapper.cc       |  4 +-
+ .../wayland/host/xdg_popup_wrapper_impl.cc    |  2 +-
+ .../wayland/host/xdg_surface_wrapper_impl.cc  |  2 +-
+ .../host/zwp_primary_selection_device.cc      |  2 +-
+ .../zwp_primary_selection_device_manager.cc   |  4 +-
+ .../host/zxdg_surface_v6_wrapper_impl.cc      |  2 +-
+ ui/platform_window/agl/platform_window_agl.h  | 36 ++++++++
+ ui/platform_window/platform_window.h          |  4 +-
+ 45 files changed, 471 insertions(+), 65 deletions(-)
+ create mode 100644 ui/aura/agl/window_tree_host_agl.h
+ create mode 100644 ui/aura/agl/window_tree_host_platform_agl.cc
+ create mode 100644 ui/aura/agl/window_tree_host_platform_agl.h
+ create mode 100644 ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.cc
+ create mode 100644 ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.h
+ create mode 100644 ui/platform_window/agl/platform_window_agl.h
+
+diff --git a/ui/aura/BUILD.gn b/ui/aura/BUILD.gn
+index 1beb9003b2fad..f3d3e359a9704 100644
+--- a/ui/aura/BUILD.gn
++++ b/ui/aura/BUILD.gn
+@@ -99,6 +99,13 @@ component("aura") {
+     "window_tree_host_platform.cc",
+   ]
+ 
++  public += [
++    "agl/window_tree_host_agl.h",
++    "agl/window_tree_host_platform_agl.h"
++  ]
++
++  sources += [ "agl/window_tree_host_platform_agl.cc" ]
++
+   friend = [ ":*" ]
+ 
+   defines = [ "AURA_IMPLEMENTATION" ]
+diff --git a/ui/aura/agl/window_tree_host_agl.h b/ui/aura/agl/window_tree_host_agl.h
+new file mode 100644
+index 0000000000000..858a078d939d0
+--- /dev/null
++++ b/ui/aura/agl/window_tree_host_agl.h
+@@ -0,0 +1,42 @@
++// Copyright 2021 LG Electronics, Inc.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++//
++// SPDX-License-Identifier: Apache-2.0
++
++#ifndef UI_AURA_AGL_WINDOW_TREE_HOST_AGL_H_
++#define UI_AURA_AGL_WINDOW_TREE_HOST_AGL_H_
++
++#include <string>
++
++#include "ui/aura/aura_export.h"
++
++namespace aura {
++
++class AURA_EXPORT WindowTreeHostAgl {
++ public:
++  WindowTreeHostAgl() = default;
++  WindowTreeHostAgl(const WindowTreeHostAgl&) = delete;
++  WindowTreeHostAgl& operator=(const WindowTreeHostAgl&) = delete;
++  ~WindowTreeHostAgl() = default;
++
++  virtual void SetAglActivateApp(const std::string& app) {}
++  virtual void SetAglAppId(const std::string& title) {}
++  virtual void SetAglReady() {}
++  virtual void SetAglBackground() {}
++  virtual void SetAglPanel(uint32_t edge) {}
++};
++
++}  // namespace aura
++
++#endif  // UI_AURA_AGL_WINDOW_TREE_HOST_AGL_H_
+diff --git a/ui/aura/agl/window_tree_host_platform_agl.cc b/ui/aura/agl/window_tree_host_platform_agl.cc
+new file mode 100644
+index 0000000000000..e34595fe0ed9c
+--- /dev/null
++++ b/ui/aura/agl/window_tree_host_platform_agl.cc
+@@ -0,0 +1,50 @@
++// Copyright 2021 LG Electronics, Inc.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++//
++// SPDX-License-Identifier: Apache-2.0
++
++#include "ui/aura/agl/window_tree_host_platform_agl.h"
++
++#include "ui/aura/window_tree_host_platform.h"
++#include "ui/platform_window/platform_window.h"
++
++namespace aura {
++
++WindowTreeHostPlatformAgl::WindowTreeHostPlatformAgl(
++    std::unique_ptr<Window> window,
++    aura::WindowTreeHostPlatform* window_tree_host_platform)
++    : aura::WindowTreeHost(std::move(window)),
++      window_tree_host_platform_(window_tree_host_platform) {}
++
++void WindowTreeHostPlatformAgl::SetAglActivateApp(const std::string& app) {
++  window_tree_host_platform_->platform_window()->SetAglActivateApp(app);
++}
++
++void WindowTreeHostPlatformAgl::SetAglAppId(const std::string& title) {
++  window_tree_host_platform_->platform_window()->SetAglAppId(title);
++}
++
++void WindowTreeHostPlatformAgl::SetAglReady() {
++  window_tree_host_platform_->platform_window()->SetAglReady();
++}
++
++void WindowTreeHostPlatformAgl::SetAglBackground() {
++  window_tree_host_platform_->platform_window()->SetAglBackground();
++}
++
++void WindowTreeHostPlatformAgl::SetAglPanel(uint32_t edge) {
++  window_tree_host_platform_->platform_window()->SetAglPanel(edge);
++}
++
++}  // namespace aura
+diff --git a/ui/aura/agl/window_tree_host_platform_agl.h b/ui/aura/agl/window_tree_host_platform_agl.h
+new file mode 100644
+index 0000000000000..181eefae346f7
+--- /dev/null
++++ b/ui/aura/agl/window_tree_host_platform_agl.h
+@@ -0,0 +1,51 @@
++// Copyright 2021 LG Electronics, Inc.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++//
++// SPDX-License-Identifier: Apache-2.0
++
++#ifndef UI_AURA_AGL_WINDOW_TREE_HOST_PLATFORM_AGL_H_
++#define UI_AURA_AGL_WINDOW_TREE_HOST_PLATFORM_AGL_H_
++
++#include <memory>
++
++#include "ui/aura/aura_export.h"
++#include "ui/aura/window_tree_host.h"
++
++namespace aura {
++
++class Window;
++class WindowTreeHostPlatform;
++
++class AURA_EXPORT WindowTreeHostPlatformAgl : public aura::WindowTreeHost {
++ public:
++  explicit WindowTreeHostPlatformAgl(
++      std::unique_ptr<Window> window,
++      aura::WindowTreeHostPlatform* window_tree_host_platform);
++  WindowTreeHostPlatformAgl(const WindowTreeHostPlatformAgl&) = delete;
++  WindowTreeHostPlatformAgl& operator=(const WindowTreeHostPlatformAgl&) = delete;
++  ~WindowTreeHostPlatformAgl() override = default;
++
++  void SetAglActivateApp(const std::string& app) override;
++  void SetAglAppId(const std::string& title) override;
++  void SetAglReady() override;
++  void SetAglBackground() override;
++  void SetAglPanel(uint32_t edge) override;
++
++ private:
++  aura::WindowTreeHostPlatform* window_tree_host_platform_;
++};
++
++}  // namespace aura
++
++#endif  // UI_AURA_AGL_WINDOW_TREE_HOST_PLATFORM_AGL_H_
+diff --git a/ui/aura/window_tree_host.h b/ui/aura/window_tree_host.h
+index 0bdb86be66ba3..b7696e6373284 100644
+--- a/ui/aura/window_tree_host.h
++++ b/ui/aura/window_tree_host.h
+@@ -30,6 +30,8 @@
+ #include "ui/gfx/native_widget_types.h"
+ #include "ui/gfx/overlay_transform.h"
+ 
++#include "ui/aura/agl/window_tree_host_agl.h"
++
+ namespace gfx {
+ class Point;
+ class Rect;
+@@ -66,7 +68,8 @@ class WindowTreeHostObserver;
+ class AURA_EXPORT WindowTreeHost : public ui::ImeKeyEventDispatcher,
+                                    public ui::EventSource,
+                                    public display::DisplayObserver,
+-                                   public ui::CompositorObserver {
++                                   public ui::CompositorObserver,
++                                   public WindowTreeHostAgl {
+  public:
+   // VideoCaptureLock ensures state necessary for capturing video remains in
+   // effect. For example, this may force keeping the compositor visible when
+diff --git a/ui/aura/window_tree_host_platform.cc b/ui/aura/window_tree_host_platform.cc
+index 4c31e785d7692..cecd1f4fc03fd 100644
+--- a/ui/aura/window_tree_host_platform.cc
++++ b/ui/aura/window_tree_host_platform.cc
+@@ -51,7 +51,7 @@ std::unique_ptr<WindowTreeHost> WindowTreeHost::Create(
+ WindowTreeHostPlatform::WindowTreeHostPlatform(
+     ui::PlatformWindowInitProperties properties,
+     std::unique_ptr<Window> window)
+-    : WindowTreeHost(std::move(window)) {
++    : WindowTreeHostPlatformAgl(std::move(window), this) {
+   size_in_pixels_ = properties.bounds.size();
+   CreateCompositor(false, false, properties.enable_compositing_based_throttling,
+                    properties.compositor_memory_limit_mb);
+@@ -59,7 +59,7 @@ WindowTreeHostPlatform::WindowTreeHostPlatform(
+ }
+ 
+ WindowTreeHostPlatform::WindowTreeHostPlatform(std::unique_ptr<Window> window)
+-    : WindowTreeHost(std::move(window)),
++    : WindowTreeHostPlatformAgl(std::move(window), this),
+       widget_(gfx::kNullAcceleratedWidget),
+       current_cursor_(ui::mojom::CursorType::kNull) {}
+ 
+diff --git a/ui/aura/window_tree_host_platform.h b/ui/aura/window_tree_host_platform.h
+index 3a9232743bda3..6c1e3a424afd4 100644
+--- a/ui/aura/window_tree_host_platform.h
++++ b/ui/aura/window_tree_host_platform.h
+@@ -15,6 +15,8 @@
+ #include "ui/gfx/native_widget_types.h"
+ #include "ui/platform_window/platform_window_delegate.h"
+ 
++#include "ui/aura/agl/window_tree_host_platform_agl.h"
++
+ namespace ui {
+ enum class DomCode;
+ class PlatformWindow;
+@@ -26,7 +28,7 @@ namespace aura {
+ 
+ // The unified WindowTreeHost implementation for platforms
+ // that implement PlatformWindow.
+-class AURA_EXPORT WindowTreeHostPlatform : public WindowTreeHost,
++class AURA_EXPORT WindowTreeHostPlatform : public WindowTreeHostPlatformAgl,
+                                            public ui::PlatformWindowDelegate {
+  public:
+   explicit WindowTreeHostPlatform(ui::PlatformWindowInitProperties properties,
+diff --git a/ui/ozone/platform/wayland/BUILD.gn b/ui/ozone/platform/wayland/BUILD.gn
+index 1a2f889dc8947..86ff8269af9e0 100644
+--- a/ui/ozone/platform/wayland/BUILD.gn
++++ b/ui/ozone/platform/wayland/BUILD.gn
+@@ -409,7 +409,6 @@ source_set("wayland") {
+ 
+   sources += [
+    "host/wayland_extensions.h",
+-   "host/wayland_extensions_stub.cc",
+   ]
+ 
+   deps += [ "extensions/agl" ]
+diff --git a/ui/ozone/platform/wayland/extensions/agl/BUILD.gn b/ui/ozone/platform/wayland/extensions/agl/BUILD.gn
+index ce289bc5dbbca..01c590e53df58 100644
+--- a/ui/ozone/platform/wayland/extensions/agl/BUILD.gn
++++ b/ui/ozone/platform/wayland/extensions/agl/BUILD.gn
+@@ -31,6 +31,8 @@ source_set("agl") {
+     "host/wayland_extensions_agl.h",
+     "host/wayland_extensions_agl_impl.cc",
+     "host/wayland_extensions_agl_impl.h",
++    "host/wayland_window_agl.cc",
++    "host/wayland_window_agl.h",
+   ]
+ 
+   deps = [
+diff --git a/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl.h b/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl.h
+index df42fc00c84da..295154dfb437d 100644
+--- a/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl.h
++++ b/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl.h
+@@ -20,6 +20,9 @@
+ namespace ui {
+ 
+ class AglShellWrapper;
++class PlatformWindowDelegate;
++class WaylandConnection;
++class WaylandWindow;
+ 
+ // AGL extensions implementation for webOS/Lite
+ class WaylandExtensionsAgl {
+@@ -29,9 +32,14 @@ class WaylandExtensionsAgl {
+   WaylandExtensionsAgl& operator=(const WaylandExtensionsAgl&) = delete;
+   virtual ~WaylandExtensionsAgl() = default;
+ 
++  virtual std::unique_ptr<WaylandWindow> CreateWaylandWindow(
++      PlatformWindowDelegate* delegate,
++      WaylandConnection* connection) = 0;
++
++
+   virtual AglShellWrapper* GetAglShell() = 0;
+ };
+ 
+ }  // namespace ui
+ 
+-#endif  // UI_OZONE_PLATFORM_WAYLAND_EXTENSIONS_AGL_HOST_WAYLAND_EXTENSIONS_AGL_H_
+\ No newline at end of file
++#endif  // UI_OZONE_PLATFORM_WAYLAND_EXTENSIONS_AGL_HOST_WAYLAND_EXTENSIONS_AGL_H_
+diff --git a/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.cc b/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.cc
+index 26a5f0550c302..87376cbb8a9d3 100644
+--- a/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.cc
++++ b/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.cc
+@@ -22,6 +22,7 @@
+ #include "base/logging.h"
+ #include "ui/base/ui_base_switches.h"
+ #include "ui/ozone/platform/wayland/extensions/agl/host/agl_shell_wrapper.h"
++#include "ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.h"
+ #include "ui/ozone/platform/wayland/extensions/agl/common/wayland_object_agl.h"
+ #include "ui/ozone/platform/wayland/host/wayland_connection.h"
+ 
+@@ -68,8 +69,8 @@ bool WaylandExtensionsAglImpl::Bind(wl_registry* registry,
+     agl_shell_ =
+         std::make_unique<AglShellWrapper>(aglshell.release(), connection_);
+ 
+-    LOG(INFO) << "Waiting until bound...";
+-    return agl_shell_->WaitUntilBoundOk();
++    //LOG(INFO) << "Waiting until bound...";
++    //return agl_shell_->WaitUntilBoundOk();
+   } else {
+     LOG(INFO) << "Cant bind.";
+   }
+@@ -85,6 +86,12 @@ AglShellWrapper* WaylandExtensionsAglImpl::GetAglShell() {
+   return agl_shell_.get();
+ }
+ 
++std::unique_ptr<WaylandWindow> WaylandExtensionsAglImpl::CreateWaylandWindow(
++    PlatformWindowDelegate* delegate,
++    WaylandConnection* connection) {
++  return std::make_unique<WaylandWindowAgl>(delegate, connection, this);
++}
++
+ std::unique_ptr<WaylandExtensions> CreateWaylandExtensions(
+     WaylandConnection* connection) {
+   return std::make_unique<WaylandExtensionsAglImpl>(connection);
+diff --git a/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.h b/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.h
+index f6cbabe99ed0b..3218589f1a09a 100644
+--- a/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.h
++++ b/ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl_impl.h
+@@ -17,12 +17,17 @@
+ #ifndef UI_OZONE_PLATFORM_WAYLAND_EXTENSIONS_AGL_HOST_WAYLAND_EXTENSIONS_AGL_IMPL_H_
+ #define UI_OZONE_PLATFORM_WAYLAND_EXTENSIONS_AGL_HOST_WAYLAND_EXTENSIONS_AGL_IMPL_H_
+ 
++#include <memory>
++
+ #include "ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl.h"
+ #include "ui/ozone/platform/wayland/host/wayland_extensions.h"
+ 
+ namespace ui {
+ 
+ class AglShellWrapper;
++class PlatformWindowDelegate;
++class WaylandConnection;
++class WaylandWindow;
+ 
+ // AGL extension implementation for webOS/Lite
+ class WaylandExtensionsAglImpl : public WaylandExtensions,
+@@ -44,6 +49,10 @@ class WaylandExtensionsAglImpl : public WaylandExtensions,
+   // WaylandExtensionsAgl overrides
+   AglShellWrapper* GetAglShell() override;
+ 
++  std::unique_ptr<WaylandWindow> CreateWaylandWindow(
++      PlatformWindowDelegate* delegate,
++      WaylandConnection* connection) override;
++
+  private:
+   std::unique_ptr<AglShellWrapper> agl_shell_;
+   WaylandConnection* connection_;
+diff --git a/ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.cc b/ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.cc
+new file mode 100644
+index 0000000000000..97b21ae537658
+--- /dev/null
++++ b/ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.cc
+@@ -0,0 +1,86 @@
++// Copyright 2021 LG Electronics, Inc.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++//
++// SPDX-License-Identifier: Apache-2.0
++
++#include "ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.h"
++
++#include "base/logging.h"
++#include "ui/ozone/platform/wayland/extensions/agl/host/agl_shell_wrapper.h"
++#include "ui/ozone/platform/wayland/extensions/agl/host/wayland_extensions_agl.h"
++#include "ui/ozone/platform/wayland/host/shell_surface_wrapper.h"
++#include "ui/ozone/platform/wayland/host/shell_toplevel_wrapper.h"
++#include "ui/ozone/platform/wayland/host/wayland_connection.h"
++
++namespace ui {
++
++WaylandWindowAgl::WaylandWindowAgl(PlatformWindowDelegate* delegate,
++                                   WaylandConnection* connection,
++                                   WaylandExtensionsAgl* agl_extensions)
++    : WaylandToplevelWindow(delegate, connection),
++      agl_extensions_(agl_extensions) {}
++
++WaylandWindowAgl::~WaylandWindowAgl() = default;
++
++void WaylandWindowAgl::SetAglActivateApp(const std::string& app) {
++  if (!agl_extensions_->GetAglShell()) {
++    LOG(ERROR) << "Agl shell wrapper is not created";
++    return;
++  }
++
++  agl_extensions_->GetAglShell()->SetAglActivateApp(app);
++  connection()->ScheduleFlush();
++}
++
++void WaylandWindowAgl::SetAglAppId(const std::string& title) {
++  if (!shell_toplevel()) {
++    LOG(ERROR) << "Shell toplevel is not created";
++    return;
++  }
++
++  shell_toplevel()->SetAppId(title);
++  connection()->ScheduleFlush();
++}
++
++void WaylandWindowAgl::SetAglReady() {
++  if (!agl_extensions_->GetAglShell()) {
++    LOG(ERROR) << "Agl shell wrapper is not created";
++    return;
++  }
++
++  agl_extensions_->GetAglShell()->SetAglReady();
++  connection()->ScheduleFlush();
++}
++
++void WaylandWindowAgl::SetAglBackground() {
++  if (!agl_extensions_->GetAglShell()) {
++    LOG(ERROR) << "Agl shell wrapper is not created";
++    return;
++  }
++
++  agl_extensions_->GetAglShell()->SetAglBackground(this);
++  connection()->ScheduleFlush();
++}
++
++void WaylandWindowAgl::SetAglPanel(uint32_t edge) {
++  if (!agl_extensions_->GetAglShell()) {
++    LOG(ERROR) << "Agl shell wrapper is not created";
++    return;
++  }
++
++  agl_extensions_->GetAglShell()->SetAglPanel(this, edge);
++  connection()->ScheduleFlush();
++}
++
++}  // namespace ui
+diff --git a/ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.h b/ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.h
+new file mode 100644
+index 0000000000000..b2a922604c001
+--- /dev/null
++++ b/ui/ozone/platform/wayland/extensions/agl/host/wayland_window_agl.h
+@@ -0,0 +1,49 @@
++// Copyright 2021 LG Electronics, Inc.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++//
++// SPDX-License-Identifier: Apache-2.0
++//
++
++#ifndef UI_OZONE_PLATFORM_WAYLAND_EXTENSIONS_AGL_HOST_WAYLAND_WINDOW_AGL_H_
++#define UI_OZONE_PLATFORM_WAYLAND_EXTENSIONS_AGL_HOST_WAYLAND_WINDOW_AGL_H_
++
++#include "ui/ozone/platform/wayland/host/wayland_toplevel_window.h"
++
++namespace ui {
++
++class WaylandExtensionsAgl;
++
++class WaylandWindowAgl : public WaylandToplevelWindow {
++ public:
++  explicit WaylandWindowAgl(PlatformWindowDelegate* delegate,
++                            WaylandConnection* connection,
++                            WaylandExtensionsAgl* agl_extensions);
++  WaylandWindowAgl(const WaylandWindowAgl&) = delete;
++  WaylandWindowAgl& operator=(const WaylandWindowAgl&) = delete;
++  ~WaylandWindowAgl() override;
++
++  // Overrides PlatformWindowAgl
++  void SetAglActivateApp(const std::string& app) override;
++  void SetAglAppId(const std::string& title) override;
++  void SetAglReady() override;
++  void SetAglBackground() override;
++  void SetAglPanel(uint32_t edge) override;
++
++ private:
++  WaylandExtensionsAgl* agl_extensions_;
++};
++
++}  // namespace ui
++
++#endif  // UI_OZONE_PLATFORM_WAYLAND_EXTENSIONS_AGL_HOST_WAYLAND_WINDOW_AGL_H_
+diff --git a/ui/ozone/platform/wayland/gpu/gl_surface_wayland.cc b/ui/ozone/platform/wayland/gpu/gl_surface_wayland.cc
+index 1cef91bb39912..26ad374718005 100644
+--- a/ui/ozone/platform/wayland/gpu/gl_surface_wayland.cc
++++ b/ui/ozone/platform/wayland/gpu/gl_surface_wayland.cc
+@@ -89,8 +89,14 @@ gfx::SwapResult GLSurfaceWayland::SwapBuffers(PresentationCallback callback,
+     return scoped_swap_buffers.result();
+   }
+   window_->root_surface()->set_surface_buffer_scale(scale_factor_);
+-  return gl::NativeViewGLSurfaceEGL::SwapBuffers(std::move(callback),
+-                                                 std::move(data));
++  gfx::SwapResult result = gl::NativeViewGLSurfaceEGL::SwapBuffers(std::move(callback),
++                                                                   std::move(data));
++
++  if (window_) {
++    window_->OnSurfaceContentChanged();
++  }
++
++  return result;
+ }
+ 
+ gfx::SwapResult GLSurfaceWayland::PostSubBuffer(int x,
+diff --git a/ui/ozone/platform/wayland/host/gtk_primary_selection_device.cc b/ui/ozone/platform/wayland/host/gtk_primary_selection_device.cc
+index 43445ea2442b4..94f0739599142 100644
+--- a/ui/ozone/platform/wayland/host/gtk_primary_selection_device.cc
++++ b/ui/ozone/platform/wayland/host/gtk_primary_selection_device.cc
+@@ -31,7 +31,7 @@ void GtkPrimarySelectionDevice::SetSelectionSource(
+   auto* data_source = source ? source->data_source() : nullptr;
+   gtk_primary_selection_device_set_selection(data_device_.get(), data_source,
+                                              serial);
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ // static
+diff --git a/ui/ozone/platform/wayland/host/gtk_primary_selection_device_manager.cc b/ui/ozone/platform/wayland/host/gtk_primary_selection_device_manager.cc
+index 2c39409808128..1e07ae6009776 100644
+--- a/ui/ozone/platform/wayland/host/gtk_primary_selection_device_manager.cc
++++ b/ui/ozone/platform/wayland/host/gtk_primary_selection_device_manager.cc
+@@ -66,7 +66,7 @@ GtkPrimarySelectionDevice* GtkPrimarySelectionDeviceManager::GetDevice() {
+         connection_,
+         gtk_primary_selection_device_manager_get_device(
+             device_manager_.get(), connection_->seat()->wl_object()));
+-    connection_->Flush();
++    connection_->ScheduleFlush();
+   }
+   DCHECK(device_);
+   return device_.get();
+@@ -77,7 +77,7 @@ GtkPrimarySelectionDeviceManager::CreateSource(
+     GtkPrimarySelectionSource::Delegate* delegate) {
+   auto* data_source =
+       gtk_primary_selection_device_manager_create_source(device_manager_.get());
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+   return std::make_unique<GtkPrimarySelectionSource>(data_source, connection_,
+                                                      delegate);
+ }
+diff --git a/ui/ozone/platform/wayland/host/proxy/wayland_proxy_impl.cc b/ui/ozone/platform/wayland/host/proxy/wayland_proxy_impl.cc
+index dee90b1aaaf72..caad70e0ab1cb 100644
+--- a/ui/ozone/platform/wayland/host/proxy/wayland_proxy_impl.cc
++++ b/ui/ozone/platform/wayland/host/proxy/wayland_proxy_impl.cc
+@@ -75,7 +75,7 @@ void WaylandProxyImpl::DestroyShmForWlBuffer(wl_buffer* buffer) {
+ }
+ 
+ void WaylandProxyImpl::FlushForTesting() {
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ ui::PlatformWindowType WaylandProxyImpl::GetWindowType(
+diff --git a/ui/ozone/platform/wayland/host/wayland_connection.cc b/ui/ozone/platform/wayland/host/wayland_connection.cc
+index 93427c52e1284..e2d45a6f5dc67 100644
+--- a/ui/ozone/platform/wayland/host/wayland_connection.cc
++++ b/ui/ozone/platform/wayland/host/wayland_connection.cc
+@@ -285,6 +285,20 @@ bool WaylandConnection::Initialize() {
+   return true;
+ }
+ 
++void WaylandConnection::ScheduleFlush() {
++  // When we are in tests, the message loop is set later when the
++  // initialization of the OzonePlatform complete. Thus, just
++  // flush directly. This doesn't happen in normal run.
++  if (!base::CurrentUIThread::IsSet()) {
++    Flush();
++  } else if (!scheduled_flush_) {
++    base::ThreadTaskRunnerHandle::Get()->PostTask(
++        FROM_HERE,
++        base::BindOnce(&WaylandConnection::Flush, base::Unretained(this)));
++    scheduled_flush_ = true;
++  }
++}
++
+ void WaylandConnection::RoundTripQueue() {
+   if (roundtrip_closure_for_testing_) {
+     roundtrip_closure_for_testing_.Run();
+@@ -354,6 +368,7 @@ void WaylandConnection::RegisterGlobalObjectFactory(
+ 
+ void WaylandConnection::Flush() {
+   wl_display_flush(display_.get());
++  scheduled_flush_ = false;
+ }
+ 
+ void WaylandConnection::UpdateInputDevices() {
+@@ -441,7 +456,7 @@ void WaylandConnection::Global(void* data,
+ 
+   auto factory_it = connection->global_object_factories_.find(interface);
+   if (connection->extensions_->Bind(registry, name, interface, version)) {
+-    DVLOG(1) << "Successfully bound to " << interface;
++    LOG(INFO) << "Successfully bound to " << interface;
+   } else if (factory_it != connection->global_object_factories_.end()) {
+     (*factory_it->second)(connection, registry, name, interface, version);
+   } else if (!connection->compositor_ &&
+@@ -609,7 +624,7 @@ void WaylandConnection::Global(void* data,
+ 
+   connection->available_globals_.emplace_back(interface, version);
+ 
+-  connection->Flush();
++  connection->ScheduleFlush();
+ }
+ 
+ base::TimeTicks WaylandConnection::ConvertPresentationTime(uint32_t tv_sec_hi,
+@@ -674,14 +689,14 @@ void WaylandConnection::PingV6(void* data,
+                                uint32_t serial) {
+   WaylandConnection* connection = static_cast<WaylandConnection*>(data);
+   zxdg_shell_v6_pong(shell_v6, serial);
+-  connection->Flush();
++  connection->ScheduleFlush();
+ }
+ 
+ // static
+ void WaylandConnection::Ping(void* data, xdg_wm_base* shell, uint32_t serial) {
+   WaylandConnection* connection = static_cast<WaylandConnection*>(data);
+   xdg_wm_base_pong(shell, serial);
+-  connection->Flush();
++  connection->ScheduleFlush();
+ }
+ 
+ // static
+diff --git a/ui/ozone/platform/wayland/host/wayland_connection.h b/ui/ozone/platform/wayland/host/wayland_connection.h
+index dfd1d060c73f2..d2d7a866d3af8 100644
+--- a/ui/ozone/platform/wayland/host/wayland_connection.h
++++ b/ui/ozone/platform/wayland/host/wayland_connection.h
+@@ -94,8 +94,8 @@ class WaylandConnection {
+ 
+   bool Initialize();
+ 
+-  // Immediately flushes the Wayland display.
+-  void Flush();
++  // Schedules a flush of the Wayland connection.
++  void ScheduleFlush();
+ 
+   // Calls wl_display_roundtrip_queue. Might be required during initialization
+   // of some objects that should block until they are initialized.
+@@ -340,6 +340,9 @@ class WaylandConnection {
+   friend class ZwpIdleInhibitManager;
+   friend class ZwpPrimarySelectionDeviceManager;
+ 
++  // Immediately flushes the Wayland display.
++  void Flush();
++
+   void RegisterGlobalObjectFactory(const char* interface_name,
+                                    wl::GlobalObjectFactory factory);
+ 
+@@ -467,6 +470,8 @@ class WaylandConnection {
+   // sizes.
+   bool surface_submission_in_pixel_coordinates_ = false;
+ 
++  bool scheduled_flush_ = false;
++
+   wl::SerialTracker serial_tracker_;
+ 
+   // Global Wayland interfaces available in the current session, with their
+diff --git a/ui/ozone/platform/wayland/host/wayland_cursor.cc b/ui/ozone/platform/wayland/host/wayland_cursor.cc
+index 891ca2e5e1f3c..48ac8b8925ddd 100644
+--- a/ui/ozone/platform/wayland/host/wayland_cursor.cc
++++ b/ui/ozone/platform/wayland/host/wayland_cursor.cc
+@@ -109,7 +109,7 @@ void WaylandCursor::HideCursor() {
+   wl_surface_attach(pointer_surface_.get(), nullptr, 0, 0);
+   wl_surface_commit(pointer_surface_.get());
+ 
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ 
+   if (listener_)
+     listener_->OnCursorBufferAttached(nullptr);
+@@ -160,7 +160,7 @@ void WaylandCursor::AttachAndCommit(wl_buffer* buffer,
+   wl_surface_attach(pointer_surface_.get(), buffer, 0, 0);
+   wl_surface_commit(pointer_surface_.get());
+ 
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ }  // namespace ui
+diff --git a/ui/ozone/platform/wayland/host/wayland_data_device.cc b/ui/ozone/platform/wayland/host/wayland_data_device.cc
+index a1d691b6315ac..ccc7bfb0305a8 100644
+--- a/ui/ozone/platform/wayland/host/wayland_data_device.cc
++++ b/ui/ozone/platform/wayland/host/wayland_data_device.cc
+@@ -46,7 +46,7 @@ void WaylandDataDevice::StartDrag(const WaylandDataSource& data_source,
+                             origin_window.root_surface()->surface(),
+                             icon_surface, serial);
+   drag_delegate_->DrawIcon();
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ void WaylandDataDevice::ResetDragDelegate() {
+@@ -78,7 +78,7 @@ void WaylandDataDevice::SetSelectionSource(WaylandDataSource* source,
+                                            uint32_t serial) {
+   auto* data_source = source ? source->data_source() : nullptr;
+   wl_data_device_set_selection(data_device_.get(), data_source, serial);
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ void WaylandDataDevice::ReadDragDataFromFD(base::ScopedFD fd,
+@@ -140,7 +140,7 @@ void WaylandDataDevice::OnEnter(void* data,
+       gfx::PointF(wl_fixed_to_double(x), wl_fixed_to_double(y)), window);
+   self->drag_delegate_->OnDragEnter(window, point, serial);
+ 
+-  self->connection()->Flush();
++  self->connection()->ScheduleFlush();
+ }
+ 
+ void WaylandDataDevice::OnMotion(void* data,
+@@ -161,7 +161,7 @@ void WaylandDataDevice::OnDrop(void* data, wl_data_device* data_device) {
+   auto* self = static_cast<WaylandDataDevice*>(data);
+   if (self->drag_delegate_) {
+     self->drag_delegate_->OnDragDrop();
+-    self->connection()->Flush();
++    self->connection()->ScheduleFlush();
+   }
+ 
+   // There are buggy Exo versions, which send 'drop' event (even for
+@@ -178,7 +178,7 @@ void WaylandDataDevice::OnLeave(void* data, wl_data_device* data_device) {
+   auto* self = static_cast<WaylandDataDevice*>(data);
+   if (self->drag_delegate_) {
+     self->drag_delegate_->OnDragLeave();
+-    self->connection()->Flush();
++    self->connection()->ScheduleFlush();
+   }
+   self->ResetDragDelegateIfNeeded();
+ }
+diff --git a/ui/ozone/platform/wayland/host/wayland_data_device_base.cc b/ui/ozone/platform/wayland/host/wayland_data_device_base.cc
+index 4287f72617708..d0c077c2e69ea 100644
+--- a/ui/ozone/platform/wayland/host/wayland_data_device_base.cc
++++ b/ui/ozone/platform/wayland/host/wayland_data_device_base.cc
+@@ -72,7 +72,7 @@ void WaylandDataDeviceBase::RegisterDeferredReadCallback() {
+ 
+   wl_callback_add_listener(deferred_read_callback_.get(), &kListener, this);
+ 
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ void WaylandDataDeviceBase::RegisterDeferredReadClosure(
+diff --git a/ui/ozone/platform/wayland/host/wayland_data_drag_controller.cc b/ui/ozone/platform/wayland/host/wayland_data_drag_controller.cc
+index f2123ec8bac3f..11750a3f55da2 100644
+--- a/ui/ozone/platform/wayland/host/wayland_data_drag_controller.cc
++++ b/ui/ozone/platform/wayland/host/wayland_data_drag_controller.cc
+@@ -217,7 +217,7 @@ void WaylandDataDragController::OnDragSurfaceFrame(void* data,
+   DCHECK(self);
+   self->DrawIconInternal();
+   self->icon_frame_callback_.reset();
+-  self->connection_->Flush();
++  self->connection_->ScheduleFlush();
+ }
+ 
+ void WaylandDataDragController::DrawIconInternal() {
+diff --git a/ui/ozone/platform/wayland/host/wayland_data_source.cc b/ui/ozone/platform/wayland/host/wayland_data_source.cc
+index de1e110f73b11..e24f31b1a8f52 100644
+--- a/ui/ozone/platform/wayland/host/wayland_data_source.cc
++++ b/ui/ozone/platform/wayland/host/wayland_data_source.cc
+@@ -119,7 +119,7 @@ void DataSource<wl_data_source>::Offer(
+     const std::vector<std::string>& mime_types) {
+   for (auto& mime_type : mime_types)
+     wl_data_source_offer(data_source_.get(), mime_type.c_str());
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ template <typename T>
+@@ -154,7 +154,7 @@ void DataSource<gtk_primary_selection_source>::Offer(
+     const std::vector<std::string>& mime_types) {
+   for (const auto& mime_type : mime_types)
+     gtk_primary_selection_source_offer(data_source_.get(), mime_type.c_str());
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ template <>
+@@ -173,7 +173,7 @@ void DataSource<zwp_primary_selection_source_v1>::Offer(
+   for (const auto& mime_type : mime_types)
+     zwp_primary_selection_source_v1_offer(data_source_.get(),
+                                           mime_type.c_str());
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ template class DataSource<gtk_primary_selection_source>;
+diff --git a/ui/ozone/platform/wayland/host/wayland_drm.cc b/ui/ozone/platform/wayland/host/wayland_drm.cc
+index 7edc0da798b9b..280350d9286c0 100644
+--- a/ui/ozone/platform/wayland/host/wayland_drm.cc
++++ b/ui/ozone/platform/wayland/host/wayland_drm.cc
+@@ -57,7 +57,7 @@ WaylandDrm::WaylandDrm(wl_drm* drm, WaylandConnection* connection)
+       &Capabilities,
+   };
+   wl_drm_add_listener(wl_drm_.get(), &kDrmListener, this);
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ 
+   // A roundtrip after binding guarantees that the client has received all
+   // supported formats and capabilities of the device.
+@@ -91,7 +91,7 @@ void WaylandDrm::CreateBuffer(const base::ScopedFD& fd,
+   wl::Object<wl_buffer> buffer(wl_drm_create_prime_buffer(
+       wl_drm_.get(), fd.get(), size.width(), size.height(), format, offset[0],
+       stride[0], offset[1], stride[1], offset[2], stride[2]));
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ 
+   std::move(callback).Run(std::move(buffer));
+ }
+@@ -145,7 +145,7 @@ void WaylandDrm::Authenticate(const char* drm_device_path) {
+   }
+ 
+   wl_drm_authenticate(wl_drm_.get(), magic);
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ 
+   // Do the roundtrip to make sure the server processes this request and
+   // authenticates us.
+diff --git a/ui/ozone/platform/wayland/host/wayland_extensions.h b/ui/ozone/platform/wayland/host/wayland_extensions.h
+index 3bd2fd7a211ae..f6ed47507d217 100644
+--- a/ui/ozone/platform/wayland/host/wayland_extensions.h
++++ b/ui/ozone/platform/wayland/host/wayland_extensions.h
+@@ -25,7 +25,9 @@ namespace ui {
+ 
+ class ShellToplevelWrapper;
+ class ShellPopupWrapper;
++class PlatformWindowDelegate;
+ class WaylandConnection;
++class WaylandWindow;
+ 
+ // Wayland extensions abstract interface to support extending of the Wayland
+ // protocol. Inherit it to provide your own Wayland extensions implementation.
+@@ -45,6 +47,10 @@ class WaylandExtensions {
+ 
+   // Checks whether the extensions have bound shell object(s).
+   virtual bool HasShellObject() const = 0;
++
++  virtual std::unique_ptr<WaylandWindow> CreateWaylandWindow(
++      PlatformWindowDelegate* delegate,
++      WaylandConnection* connection) = 0;
+ };
+ 
+ // Creates Wayland extensions.
+diff --git a/ui/ozone/platform/wayland/host/wayland_keyboard.cc b/ui/ozone/platform/wayland/host/wayland_keyboard.cc
+index c6e64f1e55da3..473a702bf8987 100644
+--- a/ui/ozone/platform/wayland/host/wayland_keyboard.cc
++++ b/ui/ozone/platform/wayland/host/wayland_keyboard.cc
+@@ -54,7 +54,7 @@ class WaylandKeyboard::ZCRExtendedKeyboard {
+ 
+   void AckKey(uint32_t serial, bool handled) {
+     zcr_extended_keyboard_v1_ack_key(obj_.get(), serial, handled);
+-    keyboard_->connection_->Flush();
++    keyboard_->connection_->ScheduleFlush();
+   }
+ 
+   // Returns true if connected object will send zcr_extended_keyboard::peek_key.
+@@ -247,7 +247,7 @@ void WaylandKeyboard::FlushInput(base::OnceClosure closure) {
+   // get spurious repeats.
+   sync_callback_.reset(wl_display_sync(connection_->display_wrapper()));
+   wl_callback_add_listener(sync_callback_.get(), &callback_listener_, this);
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ void WaylandKeyboard::DispatchKey(unsigned int key,
+diff --git a/ui/ozone/platform/wayland/host/wayland_popup.cc b/ui/ozone/platform/wayland/host/wayland_popup.cc
+index 84e429457462e..cb13557093dc2 100644
+--- a/ui/ozone/platform/wayland/host/wayland_popup.cc
++++ b/ui/ozone/platform/wayland/host/wayland_popup.cc
+@@ -124,7 +124,7 @@ void WaylandPopup::Show(bool inactive) {
+     return;
+   }
+ 
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+   WaylandWindow::Show(inactive);
+ }
+ 
+@@ -147,7 +147,7 @@ void WaylandPopup::Hide() {
+     decorated_via_aura_popup_ = false;
+   }
+ 
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ bool WaylandPopup::IsVisible() const {
+diff --git a/ui/ozone/platform/wayland/host/wayland_shm.cc b/ui/ozone/platform/wayland/host/wayland_shm.cc
+index 80d27227b9ab3..2b6c4f31ca0d8 100644
+--- a/ui/ozone/platform/wayland/host/wayland_shm.cc
++++ b/ui/ozone/platform/wayland/host/wayland_shm.cc
+@@ -62,7 +62,7 @@ wl::Object<wl_buffer> WaylandShm::CreateBuffer(const base::ScopedFD& fd,
+       with_alpha_channel ? WL_SHM_FORMAT_ARGB8888 : WL_SHM_FORMAT_XRGB8888;
+   wl::Object<wl_buffer> shm_buffer(wl_shm_pool_create_buffer(
+       pool.get(), 0, size.width(), size.height(), size.width() * 4, format));
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+   return shm_buffer;
+ }
+ 
+diff --git a/ui/ozone/platform/wayland/host/wayland_surface.cc b/ui/ozone/platform/wayland/host/wayland_surface.cc
+index cd178f9aaee00..ffe5062402b33 100644
+--- a/ui/ozone/platform/wayland/host/wayland_surface.cc
++++ b/ui/ozone/platform/wayland/host/wayland_surface.cc
+@@ -267,7 +267,7 @@ void WaylandSurface::UpdateBufferDamageRegion(const gfx::Rect& damage_px) {
+ void WaylandSurface::Commit(bool flush) {
+   wl_surface_commit(surface_.get());
+   if (flush)
+-    connection_->Flush();
++    connection_->ScheduleFlush();
+ }
+ 
+ void WaylandSurface::set_surface_buffer_scale(float scale) {
+diff --git a/ui/ozone/platform/wayland/host/wayland_toplevel_window.cc b/ui/ozone/platform/wayland/host/wayland_toplevel_window.cc
+index e39daa898c9a5..68aebd357fdc2 100644
+--- a/ui/ozone/platform/wayland/host/wayland_toplevel_window.cc
++++ b/ui/ozone/platform/wayland/host/wayland_toplevel_window.cc
+@@ -131,7 +131,7 @@ void WaylandToplevelWindow::DispatchHostWindowDragMovement(
+   else
+     shell_toplevel_->SurfaceResize(connection(), hittest);
+ 
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ void WaylandToplevelWindow::Show(bool inactive) {
+@@ -166,7 +166,7 @@ void WaylandToplevelWindow::Hide() {
+     aura_surface_.reset();
+   }
+   shell_toplevel_.reset();
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ bool WaylandToplevelWindow::IsVisible() const {
+@@ -183,7 +183,7 @@ void WaylandToplevelWindow::SetTitle(const std::u16string& title) {
+ 
+   if (shell_toplevel_) {
+     shell_toplevel_->SetTitle(title);
+-    connection()->Flush();
++    connection()->ScheduleFlush();
+   }
+ }
+ 
+@@ -262,13 +262,13 @@ void WaylandToplevelWindow::Activate() {
+   // but nothing more happens (until the user moves the mouse over a Lacros
+   // window in which case events will start and the activation will come
+   // through).
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ void WaylandToplevelWindow::Deactivate() {
+   if (shell_toplevel_ && shell_toplevel_->SupportsActivation()) {
+     shell_toplevel_->Deactivate();
+-    connection()->Flush();
++    connection()->ScheduleFlush();
+   }
+ }
+ 
+@@ -877,7 +877,7 @@ void WaylandToplevelWindow::TriggerStateChanges() {
+ 
+   delegate()->OnWindowStateChanged(previous_state_, state_);
+ 
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ void WaylandToplevelWindow::SetWindowState(PlatformWindowState state) {
+@@ -908,7 +908,7 @@ void WaylandToplevelWindow::SetSizeConstraints() {
+   if (max_size_dip.has_value())
+     shell_toplevel_->SetMaxSize(max_size_dip->width(), max_size_dip->height());
+ 
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ void WaylandToplevelWindow::SetOrResetRestoredBounds() {
+diff --git a/ui/ozone/platform/wayland/host/wayland_window.cc b/ui/ozone/platform/wayland/host/wayland_window.cc
+index f8b8c36a745e5..e415efde8ccd8 100644
+--- a/ui/ozone/platform/wayland/host/wayland_window.cc
++++ b/ui/ozone/platform/wayland/host/wayland_window.cc
+@@ -430,7 +430,7 @@ void WaylandWindow::SetDecorationInsets(const gfx::Insets* insets_px) {
+   else
+     frame_insets_px_ = absl::nullopt;
+   UpdateDecorations();
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ void WaylandWindow::SetWindowIcons(const gfx::ImageSkia& window_icon,
+@@ -522,6 +522,10 @@ void WaylandWindow::HandleSurfaceConfigure(uint32_t serial) {
+       << "Only shell surfaces must receive HandleSurfaceConfigure calls.";
+ }
+ 
++void WaylandWindow::OnSurfaceContentChanged() {
++  connection_->ScheduleFlush();
++}
++
+ void WaylandWindow::HandleToplevelConfigure(int32_t widht,
+                                             int32_t height,
+                                             const WindowStates& window_states) {
+@@ -551,7 +555,7 @@ void WaylandWindow::UpdateVisualSize(const gfx::Size& size_px) {
+ 
+   if (apply_pending_state_on_update_visual_size_for_testing_) {
+     root_surface_->ApplyPendingState();
+-    connection_->Flush();
++    connection_->ScheduleFlush();
+   }
+ }
+ 
+@@ -661,7 +665,7 @@ bool WaylandWindow::Initialize(PlatformWindowInitProperties properties) {
+   std::vector<gfx::Rect> region{gfx::Rect{size_px_}};
+   root_surface_->set_opaque_region(&region);
+   root_surface_->ApplyPendingState();
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ 
+   return true;
+ }
+@@ -957,7 +961,7 @@ void WaylandWindow::ProcessPendingBoundsDip(uint32_t serial) {
+     // window has been applied.
+     SetWindowGeometry(pending_bounds_dip_);
+     AckConfigure(serial);
+-    connection()->Flush();
++    connection()->ScheduleFlush();
+   } else if (!pending_configures_.empty() &&
+              pending_bounds_dip_.size() ==
+                  pending_configures_.back().bounds_dip.size()) {
+@@ -1051,7 +1055,7 @@ bool WaylandWindow::ProcessVisualSizeUpdate(const gfx::Size& size_px) {
+     auto serial = result->serial;
+     SetWindowGeometry(result->bounds_dip);
+     AckConfigure(serial);
+-    connection()->Flush();
++    connection()->ScheduleFlush();
+     pending_configures_.erase(pending_configures_.begin(), ++result);
+     return true;
+   }
+diff --git a/ui/ozone/platform/wayland/host/wayland_window.h b/ui/ozone/platform/wayland/host/wayland_window.h
+index f0f75d4481cd2..dae1ddcd2933f 100644
+--- a/ui/ozone/platform/wayland/host/wayland_window.h
++++ b/ui/ozone/platform/wayland/host/wayland_window.h
+@@ -218,6 +218,8 @@ class WaylandWindow : public PlatformWindow,
+   // currently bound to.
+   virtual void HandleSurfaceConfigure(uint32_t serial);
+ 
++  void OnSurfaceContentChanged();
++
+   struct WindowStates {
+     bool is_maximized = false;
+     bool is_fullscreen = false;
+diff --git a/ui/ozone/platform/wayland/host/wayland_window_drag_controller.cc b/ui/ozone/platform/wayland/host/wayland_window_drag_controller.cc
+index 6f45f47a71c25..a269ec9b368a4 100644
+--- a/ui/ozone/platform/wayland/host/wayland_window_drag_controller.cc
++++ b/ui/ozone/platform/wayland/host/wayland_window_drag_controller.cc
+@@ -84,7 +84,7 @@ class WaylandWindowDragController::ExtendedDragSource {
+     auto* surface = window ? window->root_surface()->surface() : nullptr;
+     zcr_extended_drag_source_v1_drag(source_.get(), surface, offset.x(),
+                                      offset.y());
+-    connection_.Flush();
++    connection_.ScheduleFlush();
+   }
+ 
+  private:
+diff --git a/ui/ozone/platform/wayland/host/wayland_window_factory.cc b/ui/ozone/platform/wayland/host/wayland_window_factory.cc
+index 4857125bb5f34..b2f73218681b9 100644
+--- a/ui/ozone/platform/wayland/host/wayland_window_factory.cc
++++ b/ui/ozone/platform/wayland/host/wayland_window_factory.cc
+@@ -13,6 +13,8 @@
+ #include "ui/ozone/platform/wayland/host/wayland_window.h"
+ #include "ui/platform_window/platform_window_init_properties.h"
+ 
++#include "ui/ozone/platform/wayland/host/wayland_extensions.h"
++
+ namespace ui {
+ 
+ namespace {
+@@ -41,6 +43,13 @@ std::unique_ptr<WaylandWindow> WaylandWindow::Create(
+       // toplevel window instead.
+       if (auto* parent =
+               GetParentWindow(connection, properties.parent_widget)) {
++
++        if (connection->extensions()) {
++          window = connection->extensions()->CreateWaylandWindow(delegate,
++                                                                 connection);
++          if (window)
++            break;
++        }
+         window = std::make_unique<WaylandPopup>(delegate, connection, parent);
+       } else {
+         DLOG(WARNING) << "Failed to determine for menu/popup window.";
+@@ -52,6 +61,12 @@ std::unique_ptr<WaylandWindow> WaylandWindow::Create(
+     case PlatformWindowType::kDrag:
+       // TODO(msisov): Figure out what kind of surface we need to create for
+       // bubble and drag windows.
++      if (connection->extensions()) {
++        window =
++            connection->extensions()->CreateWaylandWindow(delegate, connection);
++        if (window)
++          break;
++      }
+       window = std::make_unique<WaylandToplevelWindow>(delegate, connection);
+       break;
+     default:
+diff --git a/ui/ozone/platform/wayland/host/wayland_zwp_linux_dmabuf.cc b/ui/ozone/platform/wayland/host/wayland_zwp_linux_dmabuf.cc
+index 3db8cb5e5dba9..5d6293e016842 100644
+--- a/ui/ozone/platform/wayland/host/wayland_zwp_linux_dmabuf.cc
++++ b/ui/ozone/platform/wayland/host/wayland_zwp_linux_dmabuf.cc
+@@ -104,7 +104,7 @@ void WaylandZwpLinuxDmabuf::CreateBuffer(const base::ScopedFD& fd,
+     // created buffer and notify the client about it via the |callback|.
+     pending_params_.emplace(std::move(params), std::move(callback));
+   }
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ bool WaylandZwpLinuxDmabuf::CanCreateBufferImmed() const {
+@@ -150,7 +150,7 @@ void WaylandZwpLinuxDmabuf::NotifyRequestCreateBufferDone(
+ 
+   pending_params_.erase(it);
+ 
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ // static
+diff --git a/ui/ozone/platform/wayland/host/xdg_foreign_wrapper.cc b/ui/ozone/platform/wayland/host/xdg_foreign_wrapper.cc
+index 8b8591fabe015..9b3c6e5136d5d 100644
+--- a/ui/ozone/platform/wayland/host/xdg_foreign_wrapper.cc
++++ b/ui/ozone/platform/wayland/host/xdg_foreign_wrapper.cc
+@@ -162,7 +162,7 @@ void XdgForeignWrapperImpl<zxdg_exporter_v1, zxdg_exported_v1>::
+   zxdg_exported_v1_add_listener(exported_surface.exported.get(),
+                                 &kExportedListener, this);
+   exported_surfaces_.emplace_back(std::move(exported_surface));
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ template <>
+@@ -176,7 +176,7 @@ void XdgForeignWrapperImpl<zxdg_exporter_v2, zxdg_exported_v2>::
+   zxdg_exported_v2_add_listener(exported_surface.exported.get(),
+                                 &kExportedListener, this);
+   exported_surfaces_.emplace_back(std::move(exported_surface));
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+ }
+ 
+ // static
+diff --git a/ui/ozone/platform/wayland/host/xdg_popup_wrapper_impl.cc b/ui/ozone/platform/wayland/host/xdg_popup_wrapper_impl.cc
+index 23b7ad8fbf3cc..2e1f8fc129bf7 100644
+--- a/ui/ozone/platform/wayland/host/xdg_popup_wrapper_impl.cc
++++ b/ui/ozone/platform/wayland/host/xdg_popup_wrapper_impl.cc
+@@ -230,7 +230,7 @@ bool XDGPopupWrapperImpl::SetBounds(const gfx::Rect& new_bounds) {
+   xdg_popup_reposition(xdg_popup_.get(), positioner.get(),
+                        ++next_reposition_token_);
+ 
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+   return true;
+ }
+ 
+diff --git a/ui/ozone/platform/wayland/host/xdg_surface_wrapper_impl.cc b/ui/ozone/platform/wayland/host/xdg_surface_wrapper_impl.cc
+index 048071b4b7b76..692f562e203f0 100644
+--- a/ui/ozone/platform/wayland/host/xdg_surface_wrapper_impl.cc
++++ b/ui/ozone/platform/wayland/host/xdg_surface_wrapper_impl.cc
+@@ -40,7 +40,7 @@ bool XDGSurfaceWrapperImpl::Initialize() {
+   }
+ 
+   xdg_surface_add_listener(xdg_surface_.get(), &xdg_surface_listener, this);
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+   return true;
+ }
+ 
+diff --git a/ui/ozone/platform/wayland/host/zwp_primary_selection_device.cc b/ui/ozone/platform/wayland/host/zwp_primary_selection_device.cc
+index d02c76db80aa2..9e7e0a916d66d 100644
+--- a/ui/ozone/platform/wayland/host/zwp_primary_selection_device.cc
++++ b/ui/ozone/platform/wayland/host/zwp_primary_selection_device.cc
+@@ -31,7 +31,7 @@ void ZwpPrimarySelectionDevice::SetSelectionSource(
+   auto* data_source = source ? source->data_source() : nullptr;
+   zwp_primary_selection_device_v1_set_selection(data_device_.get(), data_source,
+                                                 serial);
+-  connection()->Flush();
++  connection()->ScheduleFlush();
+ }
+ 
+ // static
+diff --git a/ui/ozone/platform/wayland/host/zwp_primary_selection_device_manager.cc b/ui/ozone/platform/wayland/host/zwp_primary_selection_device_manager.cc
+index 9d5d79635b66d..2ca82ce6031ba 100644
+--- a/ui/ozone/platform/wayland/host/zwp_primary_selection_device_manager.cc
++++ b/ui/ozone/platform/wayland/host/zwp_primary_selection_device_manager.cc
+@@ -66,7 +66,7 @@ ZwpPrimarySelectionDevice* ZwpPrimarySelectionDeviceManager::GetDevice() {
+         connection_,
+         zwp_primary_selection_device_manager_v1_get_device(
+             device_manager_.get(), connection_->seat()->wl_object()));
+-    connection_->Flush();
++    connection_->ScheduleFlush();
+   }
+   DCHECK(device_);
+   return device_.get();
+@@ -77,7 +77,7 @@ ZwpPrimarySelectionDeviceManager::CreateSource(
+     ZwpPrimarySelectionSource::Delegate* delegate) {
+   auto* data_source = zwp_primary_selection_device_manager_v1_create_source(
+       device_manager_.get());
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+   return std::make_unique<ZwpPrimarySelectionSource>(data_source, connection_,
+                                                      delegate);
+ }
+diff --git a/ui/ozone/platform/wayland/host/zxdg_surface_v6_wrapper_impl.cc b/ui/ozone/platform/wayland/host/zxdg_surface_v6_wrapper_impl.cc
+index e900f9d37e8ad..5c4c538800f65 100644
+--- a/ui/ozone/platform/wayland/host/zxdg_surface_v6_wrapper_impl.cc
++++ b/ui/ozone/platform/wayland/host/zxdg_surface_v6_wrapper_impl.cc
+@@ -43,7 +43,7 @@ bool ZXDGSurfaceV6WrapperImpl::Initialize() {
+ 
+   zxdg_surface_v6_add_listener(zxdg_surface_v6_.get(),
+                                &zxdg_surface_v6_listener, this);
+-  connection_->Flush();
++  connection_->ScheduleFlush();
+   return true;
+ }
+ 
+diff --git a/ui/platform_window/agl/platform_window_agl.h b/ui/platform_window/agl/platform_window_agl.h
+new file mode 100644
+index 0000000000000..4bc915d663e72
+--- /dev/null
++++ b/ui/platform_window/agl/platform_window_agl.h
+@@ -0,0 +1,36 @@
++// Copyright 2021 LG Electronics, Inc.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++//
++// SPDX-License-Identifier: Apache-2.0
++
++#ifndef UI_PLATFORM_WINDOW_AGL_PLATFORM_WINDOW_AGL_H_
++#define UI_PLATFORM_WINDOW_AGL_PLATFORM_WINDOW_AGL_H_
++
++#include <string>
++
++namespace ui {
++
++// AGL additions for platform window.
++class PlatformWindowAgl {
++ public:
++  virtual void SetAglActivateApp(const std::string& app) {}
++  virtual void SetAglAppId(const std::string& title) {}
++  virtual void SetAglReady() {}
++  virtual void SetAglBackground() {}
++  virtual void SetAglPanel(uint32_t edge) {}
++};
++
++}  // namespace ui
++
++#endif  // UI_PLATFORM_WINDOW_AGL_PLATFORM_WINDOW_AGL_H_
+diff --git a/ui/platform_window/platform_window.h b/ui/platform_window/platform_window.h
+index a7bd3ef17a728..80f67671b88cf 100644
+--- a/ui/platform_window/platform_window.h
++++ b/ui/platform_window/platform_window.h
+@@ -9,6 +9,7 @@
+ #include <string>
+ #include <vector>
+ 
++#include "agl/platform_window_agl.h"
+ #include "base/component_export.h"
+ #include "ui/base/class_property.h"
+ #include "ui/base/ui_base_types.h"
+@@ -32,7 +33,8 @@ class PlatformCursor;
+ 
+ // Generic PlatformWindow interface.
+ class COMPONENT_EXPORT(PLATFORM_WINDOW) PlatformWindow
+-    : public PropertyHandler {
++    : public PropertyHandler,
++      public PlatformWindowAgl {
+  public:
+   PlatformWindow();
+   ~PlatformWindow() override;
+-- 
+2.39.2
+