Add resize gutter layers to DelegatedFrameHost

content/browser/compositor/delegated_frame_host.h

Index: content/browser/compositor/delegated_frame_host.h
diff --git a/content/browser/compositor/delegated_frame_host.h b/content/browser/compositor/delegated_frame_host.h
index 5cb93010567641e3f9084ad3eabf931a72e4aed8..e2f7ee5fa86f5a817614c92a5d373b654a6f706d 100644
--- a/content/browser/compositor/delegated_frame_host.h
+++ b/content/browser/compositor/delegated_frame_host.h
@@ -202,6 +202,10 @@ class CONTENT_EXPORT DelegatedFrameHost
   // Checks if the resize lock can be released because we received an new frame.
   void CheckResizeLock();
 
+  // Update the layers for the resize gutters to the right and bottom of the
+  // surface layer.
+  void UpdateGutters();
+
   // Called after async thumbnailer task completes.  Scales and crops the result
   // of the copy.
   static void CopyFromCompositingSurfaceHasResultForVideo(
@@ -257,6 +261,12 @@ class CONTENT_EXPORT DelegatedFrameHost
   bool skipped_frames_;
   std::vector<ui::LatencyInfo> skipped_latency_info_list_;
 
+  scoped_ptr<ui::Layer> right_gutter_;
+  scoped_ptr<ui::Layer> bottom_gutter_;
+
+  // This is the last root background color from a swapped frame.
+  SkColor background_color_;
+
   // State for rendering into a Surface.
   scoped_ptr<cc::SurfaceIdAllocator> id_allocator_;
   scoped_ptr<cc::SurfaceFactory> surface_factory_;