Implement CSSOM Smooth Scroll API

public/platform/WebAnimationCurve.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:
  * 1.  Redistributions of source code must retain the above copyright
  *     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 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
  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 #ifndef WebAnimationCurve_h
 #define WebAnimationCurve_h
 
 #include "WebCommon.h"
 
-#define WEB_FILTER_ANIMATION_CURVE_IS_DEFINED 1
+#define WEB_SCROLL_OFFSET_ANIMATION_CURVE_IS_DEFINED 1
 
 namespace blink {
 
 class WebAnimationCurve {
 public:
     virtual ~WebAnimationCurve() { }
 
     enum TimingFunctionType {
         TimingFunctionTypeEase,
         TimingFunctionTypeEaseIn,
         TimingFunctionTypeEaseOut,
         TimingFunctionTypeEaseInOut,
         TimingFunctionTypeLinear
     };
 
     enum AnimationCurveType {
         AnimationCurveTypeFilter,
         AnimationCurveTypeFloat,
+        AnimationCurveTypeScrollOffset,
         AnimationCurveTypeTransform,
     };
 
     virtual AnimationCurveType type() const = 0;
 };
 
 } // namespace blink
 
 #endif // WebAnimationCurve_h