Animation: Implement DoubleStyleInterpolation in StringKeyframe

Source/core/animation/DoubleStyleInterpolation.h

 // Copyright 2014 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 DoubleStyleInterpolation_h
 #define DoubleStyleInterpolation_h
 
 #include "core/animation/StyleInterpolation.h"
 
 namespace blink {
 
 enum ClampRange {
     NoClamp,
-    ClampOpacity
+    ClampOpacity,
+    ClampInteger,
+    ClampZoom,
+    ClampOrphans,
+    // ClampOne for SVGStrokeMiterLimit and Widows interpolation
+    ClampOne,
+    ClampZero
 };
 
 class DoubleStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtrWillBeRawPtr<DoubleStyleInterpolation> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id, ClampRange clamp)
     {
         return adoptRefWillBeNoop(new DoubleStyleInterpolation(doubleToInterpolableValue(start), doubleToInterpolableValue(end), id, clamp, false));
     }
 
     static PassRefPtrWillBeRawPtr<DoubleStyleInterpolation> maybeCreateFromMotionRotation(const CSSValue& start, const CSSValue& end, CSSPropertyID);
@@ skipping 16 matching lines @@
     static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToDouble(InterpolableValue*, ClampRange);
     static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToMotionRotation(InterpolableValue*, bool);
 
     ClampRange m_clamp;
     bool m_flag;
 
     friend class AnimationDoubleStyleInterpolationTest;
 };
 }
 #endif