Don't submit empty frames in android webview

android_webview/browser/surfaces_instance.h

Index: android_webview/browser/surfaces_instance.h
diff --git a/android_webview/browser/surfaces_instance.h b/android_webview/browser/surfaces_instance.h
index 13f75e83b3eb689178630396c0335f37b4394e11..f84ae0551100286f453315b9ac60b99288094587 100644
--- a/android_webview/browser/surfaces_instance.h
+++ b/android_webview/browser/surfaces_instance.h
@@ -72,7 +72,7 @@ class SurfacesInstance : public base::RefCounted<SurfacesInstance>,
                        const gfx::Rect& damage_rect) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
 
-  void SetEmptyRootFrame();
+  void SetSolidColorRootFrame();
 
   cc::FrameSinkIdAllocator frame_sink_id_allocator_;
 
@@ -90,6 +90,8 @@ class SurfacesInstance : public base::RefCounted<SurfacesInstance>,
   // This is owned by |display_|.
   ParentOutputSurface* output_surface_;
 
+  gfx::Size surface_size_;
+
   DISALLOW_COPY_AND_ASSIGN(SurfacesInstance);
 };