Android WebView: flush input events during onVSync

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index 91f9d483731a958e316bb66a69f8ccea1c5f0e67..a97958b480da6a6c04dbb075565a5421d559aa20 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -247,6 +247,11 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
       const TextSurroundingSelectionCallback& callback);
 
  private:
+  enum VSyncSubscriberType {
+    INPUT = 1 << 0,
+    BEGIN_FRAME = 1 << 1
+  };
+
   // TouchSelectionControllerClient implementation.
   virtual bool SupportsAnimation() const OVERRIDE;
   virtual void SetNeedsAnimate() OVERRIDE;
@@ -317,6 +322,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   float GetDpiScale() const;
 
+  // type is a bit field containing one or more VSyncSubscriberType.
+  void SubscribeToVSync(uint32 type);
+  void UnsubscribeToVSync(uint32 type);
+
   // The model object.
   RenderWidgetHostImpl* host_;
 
@@ -379,10 +388,11 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   const bool using_synchronous_compositor_;
 
+  uint32 vsync_subscribers_bitmask_;
+
   scoped_ptr<DelegatedFrameEvictor> frame_evictor_;
 
   size_t locks_on_frame_count_;
-  bool observing_root_window_;
 
   struct LastFrameInfo {
     LastFrameInfo(uint32 output_id,