Add timer to OffscreenCanvas's commit API

third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcher.h

 // Copyright 2016 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 OffscreenCanvasFrameDispatcher_h
 #define OffscreenCanvasFrameDispatcher_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class StaticBitmapImage;
 class WebLayer;
 
 class PLATFORM_EXPORT OffscreenCanvasFrameDispatcher {
  public:
   virtual ~OffscreenCanvasFrameDispatcher(){};
   virtual void dispatchFrame(RefPtr<StaticBitmapImage>,
+                             double commitStartTime,
                              bool isWebGLSoftwareRendering = false) = 0;
 };
 
 }  // namespace blink
 
 #endif  // OffscreenCanvasFrameDispatcher_h