app/api: add demo_activate_surface() api_binding

* Added "main_surface" entry to layers.json.
* This surface is never made invisible by activate_surface().

Signed-off-by: Marcus Fritzsch <marcus_fritzsch@mentor.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/app.hpp b/src/app.hpp
index 3f899ce..9df1573 100644
--- a/src/app.hpp
+++ b/src/app.hpp
@@ -70,6 +70,7 @@ struct App {
    int dispatch_events();
    int init_layout();
    void surface_set_layout(uint32_t surface_id);
+   char const *activate_surface(uint32_t surface_id);
 
    void add_task(char const *name, std::function<void()> &&f);
    void execute_pending();