Implement WebCompositorOutputSurface

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 <string>
 #include <vector>
@@ skipping 340 matching lines @@
   void ScrollFocusedEditableNodeIntoRect(const gfx::Rect& rect);
 
   // Requests the renderer to select the region between two points.
   void SelectRange(const gfx::Point& start, const gfx::Point& end);
 
   // Called when the reponse to a pending mouse lock request has arrived.
   // Returns true if |allowed| is true and the mouse has been successfully
   // 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);

[jbates, 2012/08/08 16:55:09]

TimeDelta is OK for now since we are in a rush, but can you file a bug to make
this more accurate in a followup patch? Some platform/OS/driver combos will not
have a timebase (eg: XP + AMD family 15), so it will be up to the interval to
keep in sync with the refresh rate.

+
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped or
   // AcceleratedSurfacePostSubBuffer.
   static void AcknowledgeBufferPresent(
       int32 route_id,
       int gpu_host_id,
       uint32 sync_point);
 
   // 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 419 matching lines @@
   bool fling_in_progress_;
 
   scoped_ptr<SmoothScrollGesture> active_smooth_scroll_gesture_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_