First Implementation of Snapped Points

third_party/WebKit/public/platform/WebGestureCurve.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
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  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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
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 #ifndef WebGestureCurve_h
 #define WebGestureCurve_h
 
+namespace gfx {
+class Vector2dF;
+}
+
 namespace blink {
 
 class WebGestureCurveTarget;
 
 // Abstract interface for curves used by ActivePlatformGestureAnimation. A
 // WebGestureCurve defines the animation parameters as a function of time
 // (zero-based), and applies the parameters directly to the target of the
 // animation.
 class WebGestureCurve {
  public:
   virtual ~WebGestureCurve() {}
 
   // Returns false if curve has finished and can no longer be applied.
   virtual bool Apply(double time, WebGestureCurveTarget*) = 0;
+  virtual void ComputeTotalScrollOffset(gfx::Vector2dF& offset) = 0;
+  virtual bool ResetCurveBySnappedOffset(const gfx::Vector2dF& offset) = 0;
 };
 
 }  // namespace blink
 
 #endif