Animation: FilterStyleInterpolation for animating filter

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 "config.h"
 #include "core/animation/StringKeyframe.h"
 
 #include "core/animation/AngleSVGInterpolation.h"
 #include "core/animation/ColorStyleInterpolation.h"
 #include "core/animation/CompositorAnimations.h"
 #include "core/animation/ConstantStyleInterpolation.h"
 #include "core/animation/DefaultSVGInterpolation.h"
 #include "core/animation/DeferredLegacyStyleInterpolation.h"
 #include "core/animation/DoubleStyleInterpolation.h"
+#include "core/animation/FilterStyleInterpolation.h"
 #include "core/animation/ImageSliceStyleInterpolation.h"
 #include "core/animation/ImageStyleInterpolation.h"
 #include "core/animation/IntegerOptionalIntegerSVGInterpolation.h"
 #include "core/animation/IntegerSVGInterpolation.h"
 #include "core/animation/LegacyStyleInterpolation.h"
 #include "core/animation/LengthBoxStyleInterpolation.h"
 #include "core/animation/LengthPairStyleInterpolation.h"
 #include "core/animation/LengthSVGInterpolation.h"
 #include "core/animation/LengthStyleInterpolation.h"
 #include "core/animation/ListSVGInterpolation.h"
@@ skipping 359 matching lines @@
     }
 
     case CSSPropertyStrokeDasharray: {
         RefPtrWillBeRawPtr<Interpolation> interpolation = SVGStrokeDasharrayStyleInterpolation::maybeCreate(*fromCSSValue, *toCSSValue, property);
         if (interpolation)
             return interpolation.release();
 
         break;
     }
 
+    case CSSPropertyWebkitFilter: {
+        RefPtrWillBeRawPtr<Interpolation> interpolation = FilterStyleInterpolation::maybeCreateList(*fromCSSValue, *toCSSValue, property);
+        if (interpolation)
+            return interpolation.release();
+
+        // FIXME: Support drop shadow interpolation.
+        fallBackToLegacy = true;
+        break;
+    }
+
     default:
         // Fall back to LegacyStyleInterpolation.
         fallBackToLegacy = true;
         break;
     }
 
     if (fromCSSValue == toCSSValue)
         return ConstantStyleInterpolation::create(fromCSSValue, property);
 
     if (forceDefaultInterpolation)
@@ skipping 135 matching lines @@
     RefPtrWillBeRawPtr<SVGPropertyBase> fromValue = attribute->currentValueBase()->cloneForAnimation(m_value);
     RefPtrWillBeRawPtr<SVGPropertyBase> toValue = attribute->currentValueBase()->cloneForAnimation(toSVGPropertySpecificKeyframe(end).value());
 
     if (!fromValue || !toValue)
         return nullptr;
 
     return createSVGInterpolation(fromValue.get(), toValue.get(), attribute.get());
 }
 
 } // namespace blink