cc: Improve frame/commit accounting

cc/thread_proxy.h

 // Copyright 2011 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 CCThreadProxy_h
 #define CCThreadProxy_h
 
 #include "CCAnimationEvents.h"
 #include "CCCompletionEvent.h"
 #include "CCLayerTreeHostImpl.h"
@@ skipping 154 matching lines @@
     CCCompletionEvent* m_textureAcquisitionCompletionEventOnImplThread;
 
     scoped_ptr<CCTextureUpdateController> m_currentTextureUpdateControllerOnImplThread;
 
     // Set when the next draw should post didCommitAndDrawFrame to the main thread.
     bool m_nextFrameIsNewlyCommittedFrameOnImplThread;
 
     bool m_renderVSyncEnabled;
 
     base::TimeDelta m_totalCommitTime;
-    size_t m_totalCommitCount;
+    int64_t m_totalCommitCount;
 };
 
 }
 
 #endif