Web Animations CSS: Support Animation of StyleImage and LengthBox

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index cf44ff1ad4889f06ec9a074659fad836853aeded..084047757776015def73b46e4927a6f3eac6534f 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -841,6 +841,8 @@ void StyleResolver::resolveKeyframes(const Element* element, const RenderStyle*
                 // FIXME: Build the correct chained timing function when this property is specified.
                 if (property == CSSPropertyWebkitAnimationTimingFunction || property == CSSPropertyAnimationTimingFunction)
                     continue;
+                if (!CSSAnimations::isAnimatableProperty(property))
+                    continue;
                 keyframe->setPropertyValue(property, firstOffsetKeyframe ? firstOffsetKeyframe->propertyValue(property) : CSSAnimatableValueFactory::create(property, keyframeStyle.get()).get());
             }
             if (!firstOffsetKeyframe)