Oilpan: move DOM string collection objects to the Oilpan heap.

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 943459796b164060b9f801ac09003f4a163cf835..8bb8d21f0a0ff1880cebfbf203bd1ea70efe9982 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -3270,4 +3270,12 @@ bool Element::supportsStyleSharing() const
     return true;
 }
 
+void Element::trace(Visitor* visitor)
+{
+    if (hasRareData())

[Mads Ager (chromium), 2014/04/29 09:05:14]

Please add a FIXME: Oilpan that this should be removed when rare data has been
moved to the heap.

+        elementRareData()->trace(visitor);
+
+    ContainerNode::trace(visitor);
+}
+
 } // namespace WebCore