resolveScopedKeyframesRules should check @keyframes declared in shadow trees.

Source/core/css/resolver/ScopedStyleTree.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 120 matching lines @@
             break;
     }
 }
 
 void ScopedStyleTree::resolveScopedKeyframesRules(const Element* element, Vector<ScopedStyleResolver*, 8>& resolvers)
 {
     Document& document = element->document();
     TreeScope& treeScope = element->treeScope();
     bool applyAuthorStyles = treeScope.applyAuthorStyles();
 
+    // Add resolvers for shadow roots hosted by the given element.
+    collectScopedResolversForHostedShadowTrees(element, resolvers);
+
+    // Add resolvers while walking up DOM tree from the given element.
     for (ScopedStyleResolver* scopedResolver = scopedResolverFor(element); scopedResolver; scopedResolver = scopedResolver->parent()) {
         if (scopedResolver->treeScope() == treeScope || (applyAuthorStyles && scopedResolver->treeScope() == document))
             resolvers.append(scopedResolver);
     }
 }
 
 inline ScopedStyleResolver* ScopedStyleTree::enclosingScopedStyleResolverFor(const ContainerNode* scopingNode)
 {
     for (; scopingNode; scopingNode = scopingNode->parentOrShadowHostNode()) {
         if (ScopedStyleResolver* scopedStyleResolver = scopedStyleResolverFor(*scopingNode))
@@ skipping 59 matching lines @@
         return;
 
     reparentNodes(resolverRemoved, resolverRemoved->parent());
     if (m_cache.scopedResolver == resolverRemoved)
         m_cache.clear();
 
     m_authorStyles.remove(scopingNode);
 }
 
 } // namespace WebCore