Integrate Chromium and WAM recipes.

Create a new layer called meta-html5-framework.
It contains the following recipes:
* chromium68 to build the browser shared library and browser code.
* chromium-browser-service for the browser widget.
* wam for the web application manager.
* wam-tinyproxy is a direct dependency of wam.

Defines a new packagegroup, which is added to the agl-demo-platform
image in case agl-html5-framework is configured as a feature.

Bug-AGL: SPEC-1885

Change-Id: I39f01ab09e198cd139e95ff3c784af563b54329b
Signed-off-by: Jacobo Aragunde Pérez <jaragunde@igalia.com>

3 files changed, 464 insertions, 0 deletions

diff --git a/meta-html5-framework/recipes-wam/chromium/chromium-browser-service.bb b/meta-html5-framework/recipes-wam/chromium/chromium-browser-service.bb
new file mode 100644
index 00000000..5bb028b9
--- /dev/null
+++ b/meta-html5-framework/recipes-wam/chromium/chromium-browser-service.bb
@@ -0,0 +1,19 @@
+SUMMARY = "Chromium browser widget"
+DESCRIPTION = "Wgt packaging for running chromium installed browser"
+HOMEPAGE = "https://webosose.org"
+SECTION = "apps"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
+
+SRC_URI = "gitsm://github.com/webosose/${PN}.git;branch=flounder;protocol=https"
+SRCREV = "b1d34892e70aee9d1c8f4602c4db28847825fb1a"
+
+PV = "1.0+git${SRCPV}"
+S = "${WORKDIR}/git"
+
+#build-time dependencies
+DEPENDS += "af-binder af-main-native chromium68"
+
+inherit cmake aglwgt
+
+RDEPENDS_${PN} += "chromium68-browser runxdg"
diff --git a/meta-html5-framework/recipes-wam/chromium/chromium68_git.bb b/meta-html5-framework/recipes-wam/chromium/chromium68_git.bb
new file mode 100644
index 00000000..791e1081
--- /dev/null
+++ b/meta-html5-framework/recipes-wam/chromium/chromium68_git.bb
@@ -0,0 +1,335 @@
+# Copyright (c) 2018 LG Electronics, Inc.
+
+SUMMARY = "Chromium webruntime for webOS"
+AUTHOR = "Lokesh Kumar Goel <lokeshkumar.goel@lge.com>"
+SECTION = "webos/apps"
+LICENSE = "Apache-2.0 & BSD-3-Clause & LGPL-2.0 & LGPL-2.1"
+LIC_FILES_CHKSUM = "\
+    file://src/LICENSE;md5=0fca02217a5d49a14dfe2d11837bb34d \
+    file://src/third_party/blink/renderer/core/LICENSE-LGPL-2;md5=36357ffde2b64ae177b2494445b79d21 \
+    file://src/third_party/blink/renderer/core/LICENSE-LGPL-2.1;md5=a778a33ef338abbaf8b8a7c36b6eec80 \
+"
+
+require gn-utils.inc
+
+inherit gettext
+
+DEPENDS = "virtual/gettext wayland wayland-native pixman freetype fontconfig openssl pango cairo icu libxkbcommon libexif dbus pciutils udev libcap alsa-lib virtual/egl elfutils-native libdrm atk gperf-native gconf nss nss-native nspr nspr-native"
+
+PROVIDES = "${BROWSER_APPLICATION}"
+
+SRC_URI = "\
+    git://github.com/webosose/${PN};branch=@15.agl.flounder;protocol=https;rev=${SRCREV_chromium68} \
+    git://github.com/webosose/v8;destsuffix=git/src/v8;rev=${SRCREV_v8} \
+"
+SRCREV_chromium68 = "5e7bce170f2dad766d7c6b30c6c87527e29ced19"
+SRCREV_v8 = "f9a5f6866468097293e02fd0fec5fe297ecaecdc"
+
+# we don't include SRCPV in PV, so we have to manually include SRCREVs in do_fetch vardeps
+do_fetch[vardeps] += "SRCREV_v8"
+SRCREV_FORMAT = "main_v8"
+
+S = "${WORKDIR}/git"
+
+SRC_DIR = "${S}/src"
+OUT_DIR = "${WORKDIR}/build"
+BUILD_TYPE = "Release"
+
+WEBRUNTIME_BUILD_TARGET = "webos:weboswebruntime"
+BROWSER_APP_BUILD_TARGET = "chrome"
+BROWSER_APPLICATION = "chromium68-browser"
+BROWSER_APPLICATION_DIR = "/opt/chromium68"
+
+TARGET = "${WEBRUNTIME_BUILD_TARGET} ${BROWSER_APP_BUILD_TARGET}"
+
+# Skip do_install_append of webos_system_bus. It is not compatible with this component.
+WEBOS_SYSTEM_BUS_FILES_LOCATION = "${S}/files/sysbus"
+
+PACKAGECONFIG ?= "jumbo use-upstream-wayland"
+
+# Options to enable debug/debug-webcore build.
+# Add the following line to local.conf (or local.dev.inc) to enable them:
+#   PACKAGECONFIG_append_pn-chromium68 = " debug debug-webcore"
+# By default debug is completely disabled to speed up build
+PACKAGECONFIG[debug] = "is_debug=false is_component_build=false symbol_level=2, is_debug=false symbol_level=0"
+PACKAGECONFIG[debug-webcore] = "remove_webcore_debug_symbols=false,remove_webcore_debug_symbols=true"
+
+# Set a default value for jumbo file merge of 8. This should be good for build
+# servers and workstations with a big number of cores. In case build is
+# happening in a machine with less cores but still enough RAM a good value could
+# be 50.
+JUMBO_FILE_MERGE_LIMIT="8"
+PACKAGECONFIG[jumbo] = "use_jumbo_build=true jumbo_file_merge_limit=${JUMBO_FILE_MERGE_LIMIT}, use_jumbo_build=false"
+
+PACKAGECONFIG[lttng] = "use_lttng=true,use_lttng=false,lttng-ust,lttng-tools lttng-modules babeltrace"
+
+# Chromium can use v4l2 device for hardware accelerated video decoding on such boards as Renesas R-car M3, for example.
+# In case of R-car m3, additional patches are required for gstreamer and v4l2apps.
+# See https://github.com/igel-oss/meta-browser-hwdecode/tree/igalia-chromium71.
+PACKAGECONFIG[use-linux-v4l2] = "use_v4l2_codec=true use_v4lplugin=true use_linux_v4l2_only=true"
+
+PACKAGECONFIG[use-upstream-wayland] = " \
+        ozone_platform_wayland_external=false ozone_platform_wayland=true \
+        use_system_minigbm=true, \
+        ozone_platform_wayland_external=true ozone_platform_wayland=false \
+"
+
+GN_ARGS = "\
+    cros_host_ar=\"${BUILD_AR}\"\
+    cros_host_cc=\"${BUILD_CC}\"\
+    cros_host_cxx=\"${BUILD_CXX}\"\
+    cros_host_extra_ldflags=\"${BUILD_LDFLAGS}\"\
+    cros_target_ar=\"${AR}\"\
+    cros_target_cc=\"${CC}\"\
+    cros_target_cxx=\"${CXX}\"\
+    enable_memorymanager_webapi=false\
+    ffmpeg_branding=\"Chrome\"\
+    host_os=\"linux\"\
+    is_cross_linux_build=true\
+    is_clang=false\
+    ozone_auto_platforms=false\
+    proprietary_codecs=true\
+    target_os=\"linux\"\
+    target_sysroot=\"${STAGING_DIR_HOST}\"\
+    treat_warnings_as_errors=false\
+    is_agl=true\
+    use_cbe=true\
+    is_chrome_cbe=true\
+    use_cups=false\
+    use_custom_libcxx=false\
+    use_kerberos=false\
+    use_neva_media=false\
+    use_ozone=true\
+    use_xkbcommon=true\
+    use_pmlog=false\
+    use_sysroot=false\
+    use_system_debugger_abort=true\
+    use_webos_gpu_info_collector=false\
+    ${PACKAGECONFIG_CONFARGS}\
+"
+
+# We need this for cross to 32 bit architectures, as we do not have a way
+# to retrieve a host gcc for 32 bits in yocto
+GN_ARGS_TOOLCHAIN = "\
+    is_host_clang=true\
+    host_toolchain=\"//build/toolchain/yocto:clang_yocto_native\" \
+    fatal_linker_warnings=false\
+    use_custom_libcxx_for_host=true\
+"
+
+# But for x86-64 previous setting fails in torque, so this makes build use
+# gcc on host, and use host toolchain for v8 snapshot and torque
+GN_ARGS_TOOLCHAIN_x86-64 = "\
+    is_host_clang=false\
+    use_custom_libcxx_for_host=false\
+    v8_snapshot_toolchain=\"//build/toolchain/cros:host\" \
+    cros_v8_snapshot_is_clang=false\
+    cros_v8_snapshot_ar=\"${BUILD_AR}\"\
+    cros_v8_snapshot_cc=\"${BUILD_CC}\"\
+    cros_v8_snapshot_cxx=\"${BUILD_CXX}\"\
+    cros_v8_snapshot_extra_ldflags=\"${BUILD_LDFLAGS}\"\
+"
+
+GN_ARGS += "${GN_ARGS_TOOLCHAIN}"
+
+python do_write_toolchain_file () {
+    """Writes a BUILD.gn file for Yocto detailing its toolchains."""
+    toolchain_dir = d.expand("${S}/src/build/toolchain/yocto")
+    bb.utils.mkdirhier(toolchain_dir)
+    toolchain_file = os.path.join(toolchain_dir, "BUILD.gn")
+    write_toolchain_file(d, toolchain_file)
+}
+addtask write_toolchain_file after do_patch before do_configure
+# end TODO: drop this after we migrate to ubuntu 16.04 or above
+
+# More options to speed up the build
+GN_ARGS += "\
+    enable_nacl=false\
+    disable_ftp_support=true\
+    enable_print_preview=false\
+    enable_remoting=false\
+    use_glib=true\
+    use_gnome_keyring=false\
+    use_pulseaudio=false\
+"
+
+# Following options help build with icecc
+GN_ARGS += "\
+    linux_use_bundled_binutils=false\
+    use_debug_fission=false\
+"
+
+# Respect ld-is-gold in DISTRO_FEATURES when enabling gold
+# Similar patch applied in meta-browser
+# http://patchwork.openembedded.org/patch/77755/
+EXTRA_OEGN_GOLD = "${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-gold', 'use_gold=true', 'use_gold=false', d)}"
+GN_ARGS += "${EXTRA_OEGN_GOLD}"
+
+GN_ARGS_append_arm = " target_cpu=\"arm\""
+GN_ARGS_append_qemux86 = " target_cpu=\"x86\""
+GN_ARGS_append_aarch64 = " target_cpu=\"arm64\""
+
+# ARM builds need special additional flags (see ${S}/build/config/arm.gni).
+ARM_FLOAT_ABI = "${@bb.utils.contains('TUNE_FEATURES', 'callconvention-hard', 'hard', 'softfp', d)}"
+GN_ARGS_append_armv6 = " arm_arch=\"armv6\" arm_version=6 arm_float_abi=\"${ARM_FLOAT_ABI}\""
+GN_ARGS_append_armv7a = " arm_arch=\"armv7-a\" arm_version=7 arm_float_abi=\"${ARM_FLOAT_ABI}\""
+GN_ARGS_append_armv7ve = " arm_arch=\"armv7ve\" arm_version=7 arm_float_abi=\"${ARM_FLOAT_ABI}\""
+# tcmalloc's atomicops-internals-arm-v6plus.h uses the "dmb" instruction that
+# is not available on (some?) ARMv6 models, which causes the build to fail.
+GN_ARGS_append_armv6 += 'use_allocator="none"'
+# The WebRTC code fails to build on ARMv6 when NEON is enabled.
+# https://bugs.chromium.org/p/webrtc/issues/detail?id=6574
+GN_ARGS_append_armv6 += 'arm_use_neon=false'
+
+# Doesn't build for armv[45]*
+COMPATIBLE_MACHINE = "(-)"
+COMPATIBLE_MACHINE_aarch64 = "(.*)"
+COMPATIBLE_MACHINE_armv6 = "(.*)"
+COMPATIBLE_MACHINE_armv7a = "(.*)"
+COMPATIBLE_MACHINE_armv7ve = "(.*)"
+COMPATIBLE_MACHINE_x86 = "(.*)"
+COMPATIBLE_MACHINE_x86-64 = "(.*)"
+
+#CHROMIUM_PLUGINS_PATH = "${libdir}"
+CBE_DATA_PATH = "${libdir}/cbe"
+CBE_DATA_LOCALES_PATH = "${CBE_DATA_PATH}/locales"
+
+# The text relocations are intentional -- see comments in [GF-52468]
+# TODO: check if we need INSANE_SKIP on ldflags
+INSANE_SKIP_${PN} = "textrel ldflags"
+
+
+do_compile[progress] = "outof:^\[(\d+)/(\d+)\]\s+"
+do_compile() {
+    if [ ! -f ${OUT_DIR}/${BUILD_TYPE}/build.ninja ]; then
+         do_configure
+    fi
+
+    export PATH="${S}/depot_tools:$PATH"
+    ${S}/depot_tools/ninja -C ${OUT_DIR}/${BUILD_TYPE} ${TARGET}
+}
+
+do_configure() {
+    configure_env
+}
+
+configure_env() {
+    export GYP_CHROMIUM_NO_ACTION=1
+    export PATH="${S}/depot_tools:$PATH"
+
+    GN_ARGS="${GN_ARGS}"
+    echo GN_ARGS is ${GN_ARGS}
+    echo BUILD_TARGETS are ${TARGET}
+    cd ${SRC_DIR}
+    gn gen ${OUT_DIR}/${BUILD_TYPE} --args="${GN_ARGS}"
+}
+
+WINDOW_SIZE ?= "1920,1080"
+
+configure_browser_settings() {
+    USER_AGENT="Mozilla/5.0 (Linux; NetCast; U) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/${CHROMIUM_VERSION} Safari/537.31"
+    echo "${USER_AGENT}" > ${D_DIR}/user_agent_conf
+    #We can replace below WINDOW_SIZE values from build configuration if available
+    #echo "${WINDOW_SIZE}" > ${D_DIR}/window_size_conf
+}
+
+install_chromium_browser() {
+    D_DIR=${D}${BROWSER_APPLICATION_DIR}
+    install -d ${D_DIR}
+
+    # Install browser files
+     if [ -e "${SRC_DIR}/webos/install" ]; then
+         cd ${OUT_DIR}/${BUILD_TYPE}
+         xargs --arg-file=${SRC_DIR}/webos/install/default_browser/binary.list cp -R --no-dereference --preserve=mode,links -v --target-directory=${D_DIR}
+         cd ${SRC_DIR}
+         xargs --arg-file=${SRC_DIR}/webos/install/default_browser/runtime.list cp -R --no-dereference --preserve=mode,links -v --target-directory=${D_DIR}
+     fi
+
+    # AGL does not have PMLOG
+    sed -i.bak s/PmLogCtl.*// ${D_DIR}/run_webbrowser
+
+    # To execute chromium in JAILER, Security Part needs permissions change
+    # run_webbrowser: Script file for launching chromium
+    chmod -v 755 ${D_DIR}/chrome
+    chmod -v 755 ${D_DIR}/kill_webbrowser
+    chmod -v 755 ${D_DIR}/run_webbrowser
+
+    configure_browser_settings
+}
+
+MKSNAPSHOT_PATH = ""
+MKSNAPSHOT_PATH_arm = "clang_x86_v8_arm/"
+MKSNAPSHOT_PATH_aarch64 = "clang_x64_v8_arm64/"
+
+install_webruntime() {
+    install -d ${D}${libdir}
+    install -d ${D}${includedir}/${BPN}
+    install -d ${D}${CBE_DATA_PATH}
+    install -d ${D}${CBE_DATA_LOCALES_PATH}
+
+    # Install webos webview files
+    if [ -e "${SRC_DIR}/webos/install" ]; then
+        cd ${SRC_DIR}
+        xargs --arg-file=${SRC_DIR}/webos/install/weboswebruntime/staging_inc.list cp --parents --target-directory=${D}${includedir}/${BPN}
+
+        cd ${OUT_DIR}/${BUILD_TYPE}
+
+        cp libcbe.so ${D}${libdir}/
+        if [ "${WEBOS_LTTNG_ENABLED}" = "1" ]; then
+          # use bindir if building non-cbe
+          cp libchromium_lttng_provider.so ${D}${libdir}/
+        fi
+        xargs --arg-file=${SRC_DIR}/webos/install/weboswebruntime/binary.list cp --parents --target-directory=${D}${CBE_DATA_PATH}
+        cat ${SRC_DIR}/webos/install/weboswebruntime/data_locales.list | xargs -I{} install -m 755 -p {} ${D}${CBE_DATA_LOCALES_PATH}
+    fi
+
+    # move this to separate mksnapshot-cross recipe once we figure out how to build just cross mksnapshot from chromium repository
+    install -d ${D}${bindir_cross}
+    gzip -c ${OUT_DIR}/${BUILD_TYPE}/${MKSNAPSHOT_PATH}mksnapshot > ${D}${bindir_cross}/${HOST_SYS}-mksnapshot.gz
+}
+
+do_install() {
+    install_webruntime
+    install_chromium_browser
+}
+
+WEBOS_SYSTEM_BUS_DIRS_LEGACY_BROWSER_APPLICATION = " \
+    ${webos_sysbus_prvservicesdir}/${BROWSER_APPLICATION}.service \
+    ${webos_sysbus_pubservicesdir}/${BROWSER_APPLICATION}.service \
+    ${webos_sysbus_prvrolesdir}/${BROWSER_APPLICATION}.json \
+    ${webos_sysbus_pubrolesdir}/${BROWSER_APPLICATION}.json \
+"
+
+SYSROOT_DIRS_append = " ${bindir_cross}"
+
+PACKAGES_prepend = " \
+    ${PN}-cross-mksnapshot \
+    ${BROWSER_APPLICATION} \
+"
+
+FILES_${BROWSER_APPLICATION} += " \
+    ${BROWSER_APPLICATION_DIR} \
+    ${WEBOS_SYSTEM_BUS_DIRS_LEGACY_BROWSER_APPLICATION} \
+"
+
+RDEPENDS_${BROWSER_APPLICATION} += "${PN}"
+
+VIRTUAL-RUNTIME_gpu-libs ?= ""
+RDEPENDS_${PN} += "${VIRTUAL-RUNTIME_gpu-libs}"
+
+# The text relocations are intentional -- see comments in [GF-52468]
+# TODO: check if we need INSANE_SKIP on ldflags
+INSANE_SKIP_${BROWSER_APPLICATION} += "libdir ldflags textrel"
+
+FILES_${PN} = " \
+    ${libdir}/*.so \
+    ${CBE_DATA_PATH}/* \
+    ${libdir}/${BPN}/*.so \
+    ${WEBOS_SYSTEM_BUS_DIRS} \
+"
+
+FILES_${PN}-dev = " \
+    ${includedir} \
+"
+
+FILES_${PN}-cross-mksnapshot = "${bindir_cross}/${HOST_SYS}-mksnapshot.gz"
diff --git a/meta-html5-framework/recipes-wam/chromium/gn-utils.inc b/meta-html5-framework/recipes-wam/chromium/gn-utils.inc
new file mode 100644
index 00000000..bca7af8d
--- /dev/null
+++ b/meta-html5-framework/recipes-wam/chromium/gn-utils.inc
@@ -0,0 +1,110 @@
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+def gn_arch_name(yocto_arch):
+    """Translates between Yocto's architecture values and the corresponding
+    ones used by GN."""
+    translation_table = {
+        'aarch64': 'arm64',
+        'arm': 'arm',
+        'i586': 'x86',
+        'x86_64': 'x64',
+    }
+    try:
+        return translation_table[yocto_arch]
+    except KeyError:
+        bb.msg.fatal('"%s" is not a supported architecture.' % yocto_arch)
+
+
+def write_toolchain_file(d, file_path):
+    """Creates a complete GN toolchain file in |file_path|."""
+    import string
+    gcc_toolchain_tmpl = string.Template(
+        'gcc_toolchain("${toolchain_name}") {\n'
+        '  cc = "${cc}"\n'
+        '  cxx = "${cxx}"\n'
+        '  ar = "${ar}"\n'
+        '  ld = cxx  # GN expects a compiler, not a linker.\n'
+        '  nm = "${nm}"\n'
+        '  readelf = "${readelf}"\n'
+        '  extra_cflags = "${extra_cflags}"\n'
+        '  extra_cppflags = "${extra_cppflags}"\n'
+        '  extra_cxxflags = "${extra_cxxflags}"\n'
+        '  extra_ldflags = "${extra_ldflags}"\n'
+        '  toolchain_args = {\n'
+        '    current_cpu = "${current_cpu}"\n'
+        '    current_os = "linux"\n'
+        '    is_clang = false\n'
+        '  }\n'
+        '}\n'
+    )
+    clang_toolchain_tmpl = string.Template(
+        'clang_toolchain("clang_${toolchain_name}") {\n'
+        '  extra_cflags = "${extra_cflags}"\n'
+        '  extra_cppflags = "${extra_cppflags}"\n'
+        '  extra_cxxflags = "${extra_cxxflags}"\n'
+        '  extra_ldflags = "${extra_ldflags}"\n'
+        '  toolchain_args = {\n'
+        '    current_cpu = "${current_cpu}"\n'
+        '    current_os = "linux"\n'
+        '    is_clang = true\n'
+        '    use_gold = true\n'
+        '  }\n'
+        '}\n'
+    )
+
+    native_toolchain = {
+        'toolchain_name': 'yocto_native',
+        'current_cpu': gn_arch_name(d.getVar('BUILD_ARCH', True)),
+        'cc': d.expand('${BUILD_CC}'),
+        'cxx': d.expand('${BUILD_CXX}'),
+        'ar': d.expand('${BUILD_AR}'),
+        'nm': d.expand('${BUILD_NM}'),
+        'readelf': d.expand('${BUILD_PREFIX}readelf'),
+        'extra_cflags': d.expand('${BUILD_CFLAGS}'),
+        'extra_cppflags': d.expand('${BUILD_CPPFLAGS}'),
+        'extra_cxxflags': d.expand('${BUILD_CXXFLAGS}'),
+        'extra_ldflags': d.expand('${BUILD_LDFLAGS}'),
+    }
+    target_toolchain = {
+        'toolchain_name': 'yocto_target',
+        'current_cpu': gn_arch_name(d.getVar('TUNE_ARCH', True)),
+        'cc': d.expand('${CC}'),
+        'cxx': d.expand('${CXX}'),
+        'ar': d.expand('${AR}'),
+        'nm': d.expand('${NM}'),
+        'readelf': d.expand('${TARGET_PREFIX}readelf'),
+        'extra_cflags': d.expand('${TARGET_CFLAGS}'),
+        'extra_cppflags': d.expand('${TARGET_CPPFLAGS}'),
+        'extra_cxxflags': d.expand('${TARGET_CXXFLAGS}'),
+        'extra_ldflags': d.expand('${TARGET_LDFLAGS}'),
+        'strip': '',
+    }
+
+    with open(file_path, 'w') as toolchain_file:
+        toolchain_file.write(
+            '# This file has been generated automatically.\n'
+            '\n'
+            'import("//build/config/sysroot.gni")\n'
+            'import("//build/toolchain/gcc_toolchain.gni")\n'
+            '\n'
+        )
+        toolchain_file.write(gcc_toolchain_tmpl.substitute(native_toolchain))
+        toolchain_file.write(gcc_toolchain_tmpl.substitute(target_toolchain))
+        toolchain_file.write(clang_toolchain_tmpl.substitute(native_toolchain))
+        toolchain_file.write(clang_toolchain_tmpl.substitute(target_toolchain))