Implement animations for Independent CSS Transform Properties

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/CoreExport.h"
 #include "core/animation/StyleInterpolation.h"
 #include "core/css/CSSPrimitiveValue.h"
 
 namespace blink {
 
 class CORE_EXPORT DoubleStyleInterpolation : public StyleInterpolation {
 public:
+    typedef void NonInterpolableType;
+
     static PassRefPtrWillBeRawPtr<DoubleStyleInterpolation> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id, CSSPrimitiveValue::UnitType type, InterpolationRange clamp)
     {
         return adoptRefWillBeNoop(new DoubleStyleInterpolation(doubleToInterpolableValue(start), doubleToInterpolableValue(end), id, type == CSSPrimitiveValue::CSS_NUMBER, clamp, false));
     }
 
     static PassRefPtrWillBeRawPtr<DoubleStyleInterpolation> maybeCreateFromMotionRotation(const CSSValue& start, const CSSValue& end, CSSPropertyID);
 
     static bool canCreateFrom(const CSSValue&);
 
     virtual void apply(StyleResolverState&) const override;
 
     DECLARE_VIRTUAL_TRACE();
 
+    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(const CSSValue&, CSSPropertyID = CSSPropertyInvalid);
+    static PassRefPtrWillBeRawPtr<CSSValue> fromInterpolableValue(const InterpolableValue&, InterpolationRange);
+
 private:
     DoubleStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id, bool isNumber, InterpolationRange clamp, bool flag)
         : StyleInterpolation(start, end, id)
         , m_isNumber(isNumber)
         , m_clamp(clamp)
         , m_flag(flag)
     { }
 
     static PassOwnPtrWillBeRawPtr<InterpolableValue> doubleToInterpolableValue(const CSSValue&);
     static PassOwnPtrWillBeRawPtr<InterpolableValue> motionRotationToInterpolableValue(const CSSValue&);
 
-    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToDouble(InterpolableValue*, bool, InterpolationRange);
+    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToDouble(const InterpolableValue*, bool, InterpolationRange);
     static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToMotionRotation(InterpolableValue*, bool);
 
     bool m_isNumber;
     InterpolationRange m_clamp;
     bool m_flag;
 
     friend class AnimationDoubleStyleInterpolationTest;
 };
 }
 #endif