Move synthetic gesture input to be aligned with BeginFrame.

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index 190d5c9f8e1b71677811395019d9762d6fd7e1ee..c465b46e2fcb7cabee1d675bae2c63061fc72906 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -162,6 +162,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   void EndFrameSubscription() override;
   bool HasAcceleratedSurface(const gfx::Size& desired_size) override;
   gfx::Rect GetBoundsInRootWindow() override;
+  void OnSetNeedsFlushInput() override;
   void WheelEventAck(const blink::WebMouseWheelEvent& event,
                      InputEventAckState ack_result) override;
   void GestureEventAck(const blink::WebGestureEvent& event,
@@ -532,6 +533,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   // Forwards a mouse event to this view's parent window delegate.
   void ForwardMouseEventToParent(ui::MouseEvent* event);
 
+  // Adds/Removes frame observer based on state.
+  void UpdateNeedsBeginFramesInternal();
+
   // Returns the RenderViewHostDelegateView instance for this view. Returns
   // NULL on failure.
   RenderViewHostDelegateView* GetRenderViewHostDelegateView();
@@ -592,8 +596,16 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   // The begin frame source being observed.  Null if none.
   cc::BeginFrameSource* begin_frame_source_;
   cc::BeginFrameArgs last_begin_frame_args_;
+
+  // Whether a request for begin frames has been issued.
   bool needs_begin_frames_;
 
+  // Whether a request to flush input has been issued.
+  bool needs_flush_input_;
+
+  // Whether we have added ourselves as a frame observer or not.
+  bool added_frame_observer_;
+
   // Used to record the last position of the mouse.
   // While the mouse is locked, they store the last known position just as mouse
   // lock was entered.