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..f4291b3ad89ef6506b352f984f76dba744710b5a 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -858,6 +858,24 @@ void StyleResolver::keyframeStylesForAnimation(Element* e, const RenderStyle& el
     }
 }
 
+// This function is used by the WebAnimations JavaScript API method animate().
+void StyleResolver::setKeyframePropertyValues(Element* element, const Vector<RefPtr<MutableStylePropertySet> >& propertySetVector, KeyframeAnimationEffect::KeyframeVector& keyframes)
+{
+    ASSERT(RuntimeEnabledFeatures::webAnimationsAPIEnabled());
+    ASSERT(propertySetVector.size() == keyframes.size());
+
+    StyleResolverState state(element->document(), element);
+    state.setStyle(RenderStyle::create());
+
+    for (unsigned i = 0; i < propertySetVector.size(); ++i) {
+        for (unsigned j = 0; j < propertySetVector[i]->propertyCount(); ++j) {
+            CSSPropertyID id = propertySetVector[i]->propertyAt(j).id();
+            StyleBuilder::applyProperty(id, state, propertySetVector[i]->getPropertyCSSValue(id).get());
+            keyframes[i]->setPropertyValue(id, CSSAnimatableValueFactory::create(id, *state.style()).get());
+        }
+    }
+}
+
 PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(Element* e, const PseudoStyleRequest& pseudoStyleRequest, RenderStyle* parentStyle)
 {
     ASSERT(document().frame());