Web Animations API: Start implementation of Element.animate().

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 504b78502509d41b7da274a79b92bbfd7c250fb5..7ea4ffbfdf78e05280816466c5cdb4302f6a3054 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -1083,7 +1083,7 @@ void StyleResolver::applyAnimatedProperties(StyleResolverState& state, const Ani
         CSSPropertyID property = iter->key;
         if (!isPropertyForPass<pass>(property))
             continue;
-        ASSERT_WITH_MESSAGE(!iter->value->dependsOnUnderlyingValue(), "Web Animations not yet implemented: An interface for compositing onto the underlying value.");
+        RELEASE_ASSERT_WITH_MESSAGE(!iter->value->dependsOnUnderlyingValue(), "Web Animations not yet implemented: An interface for compositing onto the underlying value.");
         RefPtr<AnimatableValue> animatableValue = iter->value->compositeOnto(0);
         AnimatedStyleBuilder::applyProperty(property, state, animatableValue.get());
     }