Changing animate to beginFrame and use struct rather than naked double to allow extension.

public/web/WebWidget.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebWidget_h
 #define WebWidget_h
 
 #include "../platform/WebCanvas.h"
 #include "../platform/WebCommon.h"
 #include "../platform/WebRect.h"
 #include "../platform/WebSize.h"
+#include "WebBeginFrameArgs.h"
 #include "WebCompositionUnderline.h"
 #include "WebTextDirection.h"
 #include "WebTextInputInfo.h"
 
 namespace blink {
 
 class WebCompositeAndReadbackAsyncCallback;
 class WebInputEvent;
 class WebLayerTreeView;
 class WebMouseEvent;
@@ skipping 33 matching lines @@
     // Called to notify the WebWidget of entering/exiting fullscreen mode. The
     // resize method may be called between will{Enter,Exit}FullScreen and
     // did{Enter,Exit}FullScreen.
     virtual void willEnterFullScreen() { }
     virtual void didEnterFullScreen() { }
     virtual void willExitFullScreen() { }
     virtual void didExitFullScreen() { }
 
     // Called to update imperative animation state. This should be called before
     // paint, although the client can rate-limit these calls.
-    virtual void animate(double monotonicFrameBeginTime) { }
+    // FIXME: Remove this function once Chrome side patch lands.
+    void animate(double monotonicFrameBeginTime)
+    {
+        beginFrame(WebBeginFrameArgs(monotonicFrameBeginTime));
+    }
+    virtual void beginFrame(const WebBeginFrameArgs& frameTime) { }
 
     // Called to layout the WebWidget. This MUST be called before Paint,
     // and it may result in calls to WebWidgetClient::didInvalidateRect.
     virtual void layout() { }
 
     // Called to paint the rectangular region within the WebWidget
     // onto the specified canvas at (viewPort.x,viewPort.y). You MUST call
     // Layout before calling this method. It is okay to call paint
     // multiple times once layout has been called, assuming no other
     // changes are made to the WebWidget (e.g., once events are
@@ skipping 141 matching lines @@
     // content.
     virtual WebColor backgroundColor() const { return 0xFFFFFFFF; /* SK_ColorWHITE */ }
 
 protected:
     ~WebWidget() { }
 };
 
 } // namespace blink
 
 #endif