Provide a vsync notification to the renderer

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 364 matching lines @@
   // locked.
   bool GotResponseToLockMouseRequest(bool allowed);
 
   // Tells the RenderWidget about the latest vsync parameters.
   // Note: Make sure the timebase was obtained using
   // base::TimeTicks::HighResNow. Using the non-high res timer will result in
   // incorrect synchronization across processes.
   virtual void UpdateVSyncParameters(base::TimeTicks timebase,
                                      base::TimeDelta interval);
 
+  // Notifies the RenderWidget that the display vsync signal was triggered and
+  // now is a good time to render a new frame.
+  virtual void SendVSync(base::TimeTicks frame_time);
+
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped or
   // AcceleratedSurfacePostSubBuffer.
   static void AcknowledgeBufferPresent(
       int32 route_id,
       int gpu_host_id,
       const AcceleratedSurfaceMsg_BufferPresented_Params& params);
 
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped for
   // platforms that support deferred GPU process descheduling. This does
   // nothing if the compositor thread is enabled.
@@ skipping 153 matching lines @@
   void OnRequestMove(const gfx::Rect& pos);
   void OnSetTooltipText(const string16& tooltip_text,
                         WebKit::WebTextDirection text_direction_hint);
   void OnPaintAtSizeAck(int tag, const gfx::Size& size);
   void OnCompositorSurfaceBuffersSwapped(int32 surface_id,
                                          uint64 surface_handle,
                                          int32 route_id,
                                          const gfx::Size& size,
                                          int32 gpu_process_host_id);
   void OnSwapCompositorFrame(const cc::CompositorFrame& frame);
+  void OnEnableVSyncNotification(bool enable);
   void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
   void OnUpdateIsDelayed();
   void OnInputEventAck(WebKit::WebInputEvent::Type event_type,
                        InputEventAckState ack_result);
   void OnBeginSmoothScroll(
       int gesture_id,
       const ViewHostMsg_BeginSmoothScroll_Params &params);
   void OnSelectRangeAck();
   void OnMsgMoveCaretAck();
   virtual void OnFocus();
@@ skipping 310 matching lines @@
 #if defined(OS_WIN)
   std::list<HWND> dummy_windows_for_activation_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_