Read compositor VSync information from platform, when possible

content/browser/compositor/software_browser_compositor_output_surface.h

 // Copyright 2014 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_COMPOSITOR_SOFTWARE_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_SOFTWARE_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "base/memory/weak_ptr.h"
 #include "content/browser/compositor/browser_compositor_output_surface.h"
 #include "content/common/content_export.h"
-#include "ui/compositor/compositor.h"
-
-namespace base {
-class MessageLoopProxy;
-}
 
 namespace cc {
 class SoftwareOutputDevice;
 }
 
+namespace ui {
+class CompositorVSyncManager;
+}
+
 namespace content {
 
 class BrowserCompositorOutputSurfaceProxy;
 
 class CONTENT_EXPORT SoftwareBrowserCompositorOutputSurface
     : public BrowserCompositorOutputSurface {
  public:
   SoftwareBrowserCompositorOutputSurface(
       scoped_refptr<BrowserCompositorOutputSurfaceProxy> surface_proxy,
       scoped_ptr<cc::SoftwareOutputDevice> software_device,
       int surface_id,
       IDMap<BrowserCompositorOutputSurface>* output_surface_map,
-      base::MessageLoopProxy* compositor_message_loop,
-      base::WeakPtr<ui::Compositor> compositor);
+      const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager);
 
   virtual ~SoftwareBrowserCompositorOutputSurface();
 
  private:
   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
 
   // On the software path we need to explicitly call the proxy to update the
   // VSync parameters.
   scoped_refptr<BrowserCompositorOutputSurfaceProxy> output_surface_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(SoftwareBrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_SOFTWARE_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_