Adding support for VSyncProvider to the software drawing path

content/browser/aura/browser_compositor_output_surface_proxy.h

 // Copyright (c) 2013 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_AURA_BROWSER_COMPOSITOR_OUTPUT_SURFACE_PROXY_H_
 #define CONTENT_BROWSER_AURA_BROWSER_COMPOSITOR_OUTPUT_SURFACE_PROXY_H_
 
 #include "base/id_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
+#include "content/common/content_export.h"
 
 namespace base { class SingleThreadTaskRunner; }
 
 namespace IPC { class Message; }
 
 namespace content {
 class BrowserCompositorOutputSurface;
 
 // Directs vsync updates to the appropriate BrowserCompositorOutputSurface.
-class BrowserCompositorOutputSurfaceProxy
+class CONTENT_EXPORT BrowserCompositorOutputSurfaceProxy
     : public base::RefCountedThreadSafe<BrowserCompositorOutputSurfaceProxy> {
  public:
   BrowserCompositorOutputSurfaceProxy(
       IDMap<BrowserCompositorOutputSurface>* surface_map);
 
   // Call this before each OutputSurface is created to ensure that the
   // proxy is connected to the current host.
   void ConnectToGpuProcessHost(
       base::SingleThreadTaskRunner* compositor_thread_task_runner);
 
  private:
   friend class base::RefCountedThreadSafe<BrowserCompositorOutputSurfaceProxy>;
+  friend class SoftwareBrowserCompositorOutputSurface;
   ~BrowserCompositorOutputSurfaceProxy();
 
   void OnMessageReceivedOnCompositorThread(const IPC::Message& message);
 
   void OnUpdateVSyncParametersOnCompositorThread(int surface_id,
                                                  base::TimeTicks timebase,
                                                  base::TimeDelta interval);
 
   IDMap<BrowserCompositorOutputSurface>* surface_map_;
   int connected_to_gpu_process_host_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCompositorOutputSurfaceProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_AURA_BROWSER_COMPOSITOR_OUTPUT_SURFACE_PROXY_H_