Mus experiment in content shell on Android.

ui/platform_window/android/platform_window_android.h

Index: ui/platform_window/android/platform_window_android.h
diff --git a/ui/platform_window/android/platform_window_android.h b/ui/platform_window/android/platform_window_android.h
index 725b97692946930d9b771cefd69b6e72de4c3cd9..f81cd3b3d5eff135e1bfa3f1aeee68fa54055aa0 100644
--- a/ui/platform_window/android/platform_window_android.h
+++ b/ui/platform_window/android/platform_window_android.h
@@ -8,6 +8,7 @@
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "gpu/ipc/common/surface_handle.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
@@ -61,6 +62,8 @@ class ANDROID_WINDOW_EXPORT PlatformWindowAndroid : public PlatformWindow {
  private:
   void ReleaseWindow();
 
+  void NotifyDelegateSurfaceCreated(gpu::SurfaceHandle surface_handle,
+                                    float device_pixel_ratio);
   // Overridden from PlatformWindow:
   void Show() override;
   void Hide() override;