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..a242a6915a7d2b8d3e088ee5f9f4b52d7bc7bf76 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 +247,12 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
       const TextSurroundingSelectionCallback& callback);
 
  private:
+  enum VSyncSubscriberType {
+    INPUT = 1,
+    BEGIN_FRAME = 2

[boliu, 2014/08/20 02:54:17]

ehh, 1 << 0, 1 << 1, 1 << 2....

[hush (inactive), 2014/08/20 03:47:21]

Done.

+    // Next Type will be 4 because VSyncSubscriberType is used in a bit field.
+  };
+
   // TouchSelectionControllerClient implementation.
   virtual bool SupportsAnimation() const OVERRIDE;
   virtual void SetNeedsAnimate() OVERRIDE;
@@ -317,6 +323,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   float GetDpiScale() const;
 
+  // type is a bit field containing one or more VSyncSubscriberType.
+  void SubscribeToVSync(int type);
+
   // The model object.
   RenderWidgetHostImpl* host_;
 
@@ -379,6 +388,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   const bool using_synchronous_compositor_;
 
+  int vsync_subscribers_;

[boliu, 2014/08/20 02:54:16]

use uint32 or something, to specificy the number of bits

probably also name this vsync_subscribers_bitmask_

[hush (inactive), 2014/08/20 03:47:21]

Done.

+
   scoped_ptr<DelegatedFrameEvictor> frame_evictor_;
 
   size_t locks_on_frame_count_;