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

Source/platform/exported/WebActiveGestureAnimation.h

 /*
  * Copyright (C) 2012 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:
  *
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  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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 #ifndef WebActiveGestureAnimation_h
 #define WebActiveGestureAnimation_h
 
 #include "platform/PlatformExport.h"
+#include "public/platform/WebFrameTime.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class WebGestureCurve;
 class WebGestureCurveTarget;
 
 // Implements a gesture animation (fling scroll, etc.) using a curve with a generic interface
 // to define the animation parameters as a function of time, and applies the animation
 // to a target, again via a generic interface. It is assumed that animate() is called
 // on a more-or-less regular basis by the owner.
 class PLATFORM_EXPORT WebActiveGestureAnimation {
     WTF_MAKE_NONCOPYABLE(WebActiveGestureAnimation);
 public:
     static PassOwnPtr<WebActiveGestureAnimation> createAtAnimationStart(PassOwnPtr<WebGestureCurve>, WebGestureCurveTarget*);
     static PassOwnPtr<WebActiveGestureAnimation> createWithTimeOffset(PassOwnPtr<WebGestureCurve>, WebGestureCurveTarget*, double startTime);
     ~WebActiveGestureAnimation();
 
-    bool animate(double time);
+    bool animate(WebFrameTime);
 
 private:
     // Assumes a valid WebGestureCurveTarget that outlives the animation.
     WebActiveGestureAnimation(PassOwnPtr<WebGestureCurve>, WebGestureCurveTarget*, double startTime, bool waitingForFirstTick);
 
     double m_startTime;
     bool m_waitingForFirstTick;
     OwnPtr<WebGestureCurve> m_curve;
     WebGestureCurveTarget* m_target;
 };
 
 } // namespace blink
 
 #endif