Support unknown property strings in transition-property

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 460 matching lines @@
     BitArray<numCSSProperties> listedProperties;
     bool anyTransitionHadTransitionAll = false;
     const RenderObject* renderer = element->renderer();
     if (!animationStyleRecalc && style.display() != NONE && renderer && renderer->style() && transitionData) {
         const RenderStyle& oldStyle = *renderer->style();
 
         for (size_t i = 0; i < transitionData->propertyList().size(); ++i) {
             const CSSTransitionData::TransitionProperty& transitionProperty = transitionData->propertyList()[i];
             CSSTransitionData::TransitionPropertyType mode = transitionProperty.propertyType;
             CSSPropertyID property = transitionProperty.propertyId;
-            if (mode == CSSTransitionData::TransitionNone)
+            if (mode == CSSTransitionData::TransitionNone || mode == CSSTransitionData::TransitionUnknown)
                 continue;
 
             bool animateAll = mode == CSSTransitionData::TransitionAll;
             ASSERT(animateAll || mode == CSSTransitionData::TransitionSingleProperty);
             if (animateAll)
                 anyTransitionHadTransitionAll = true;
             const StylePropertyShorthand& propertyList = animateAll ? CSSAnimations::animatableProperties() : shorthandForProperty(property);
             // If not a shorthand we only execute one iteration of this loop, and refer to the property directly.
             for (unsigned j = 0; !j || j < propertyList.length(); ++j) {
                 CSSPropertyID id = propertyList.length() ? propertyList.properties()[j] : property;
@@ skipping 345 matching lines @@
 void CSSAnimationUpdate::trace(Visitor* visitor)
 {
     visitor->trace(m_newTransitions);
     visitor->trace(m_activeInterpolationsForAnimations);
     visitor->trace(m_activeInterpolationsForTransitions);
     visitor->trace(m_newAnimations);
     visitor->trace(m_cancelledAnimationPlayers);
 }
 
 } // namespace WebCore