Ignore filter property in CSS Animations

Source/core/animation/css/CSSAnimations.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 82 matching lines @@
                 RefPtr<TimingFunction> timingFunction;
                 if (value->isInheritedValue() && parentStyle->animations()) {
                     timingFunction = parentStyle->animations()->timingFunctionList()[0];
                 } else if (value->isValueList()) {
                     timingFunction = CSSToStyleMap::mapAnimationTimingFunction(toCSSValueList(value)->item(0));
                 } else {
                     ASSERT(value->isCSSWideKeyword());
                     timingFunction = CSSTimingData::initialTimingFunction();
                 }
                 keyframe->setEasing(timingFunction.release());
+            } else if (property == CSSPropertyFilter) {
+                // TODO(alancutter): We will not support animating filter until -webkit-filter is an alias for it.
+                // This is to prevent animations on both -webkit-filter and filter from being run on the main thread when
+                // they would otherwise run on the compositor.
+                continue;
             } else if (CSSAnimations::isAnimatableProperty(property)) {
                 keyframe->setPropertyValue(property, properties.propertyAt(j).value());
             }
         }
         keyframes.append(keyframe);
         // The last keyframe specified at a given offset is used.
         for (size_t j = 1; j < offsets.size(); ++j) {
             keyframes.append(toStringKeyframe(keyframe->cloneWithOffset(offsets[j]).get()));
         }
     }
@@ skipping 678 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_transitions);
     visitor->trace(m_pendingUpdate);
     visitor->trace(m_animations);
     visitor->trace(m_previousActiveInterpolationsForAnimations);
 #endif
 }
 
 } // namespace blink