Plumb the partial swap though image transport.

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index 5726aa74e902577446129d80707efb083318d545..aad12de59b5223d03b3628c4a4f8086ad8e3bd91 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -260,6 +260,9 @@ class RenderWidgetHostViewMac : public RenderWidgetHostView {
   virtual void AcceleratedSurfaceBuffersSwapped(
       const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params,
       int gpu_host_id) OVERRIDE;
+  virtual void AcceleratedSurfacePostSubBuffer(
+      const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params,
+      int gpu_host_id) OVERRIDE;
   virtual void GetScreenInfo(WebKit::WebScreenInfo* results) OVERRIDE;
   virtual gfx::Rect GetRootWindowBounds() OVERRIDE;
   virtual gfx::PluginWindowHandle GetCompositingSurface() OVERRIDE;
@@ -305,12 +308,6 @@ class RenderWidgetHostViewMac : public RenderWidgetHostView {
   // should be called after the software backing store has been painted to.
   void HandleDelayedGpuViewHiding();
 
-  // This is called from the display link thread, and provides the GPU
-  // process a notion of how quickly the browser is able to keep up with it.
-  void AcknowledgeSwapBuffers(int renderer_id,
-                              int32 route_id,
-                              int gpu_host_id);
-
   // These member variables should be private, but the associated ObjC class
   // needs access to them and can't be made a friend.