Add additive animation support for CSS property translate

third_party/WebKit/Source/core/animation/StringKeyframe.cpp

 // 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.
 
 #include "core/animation/StringKeyframe.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/animation/ConstantStyleInterpolation.h"
 #include "core/animation/DeferredLegacyStyleInterpolation.h"
 #include "core/animation/DoubleStyleInterpolation.h"
@@ skipping 233 matching lines @@
     case CSSPropertyBackdropFilter: {
         RefPtr<Interpolation> interpolation = FilterStyleInterpolation::maybeCreateList(*fromCSSValue, *toCSSValue, property);
         if (interpolation)
             return interpolation.release();
 
         // FIXME: Support drop shadow interpolation.
         return createLegacyStyleInterpolation(property, end, element, baseStyle);
         break;
     }
 
-    case CSSPropertyTranslate: {
-        RefPtr<Interpolation> interpolation = ListStyleInterpolation<LengthStyleInterpolation>::maybeCreateFromList(*fromCSSValue, *toCSSValue, property, range);
-        if (interpolation)
-            return interpolation.release();
-
-        // TODO(soonm): Legacy mode is used when from and to cssvaluelist length does not match.
-        return createLegacyStyleInterpolation(property, end, element, baseStyle);
-        break;
-    }
-
     case CSSPropertyScale: {
         RefPtr<Interpolation> interpolation = ListStyleInterpolation<DoubleStyleInterpolation>::maybeCreateFromList(*fromCSSValue, *toCSSValue, property, range);
         if (interpolation)
             return interpolation.release();
 
         // TODO(soonm): Legacy mode is used when from and to cssvaluelist length does not match.
         return createLegacyStyleInterpolation(property, end, element, baseStyle);
         break;
     }
 
@@ skipping 52 matching lines @@
 }
 
 PassRefPtr<Interpolation> SVGPropertySpecificKeyframe::maybeCreateInterpolation(PropertyHandle propertyHandle, Keyframe::PropertySpecificKeyframe& end, Element*, const ComputedStyle*) const
 {
     const InterpolationTypes* applicableTypes = PropertyInterpolationTypesMapping::get(propertyHandle);
     ASSERT(applicableTypes);
     return InvalidatableInterpolation::create(propertyHandle, *applicableTypes, *this, end);
 }
 
 } // namespace blink