[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/dom/ElementRareData.cpp

Index: Source/core/dom/ElementRareData.cpp
diff --git a/Source/core/dom/ElementRareData.cpp b/Source/core/dom/ElementRareData.cpp
index 8ae8da2e13c5ba8224368895c31dea7cf4ae6560..916430959661fc610a0328c9da379e109a660077 100644
--- a/Source/core/dom/ElementRareData.cpp
+++ b/Source/core/dom/ElementRareData.cpp
@@ -40,6 +40,10 @@ struct SameSizeAsElementRareData : NodeRareData {
     LayoutSize sizeForResizing;
     IntSize scrollOffset;
     void* pointers[14];
+#if !ENABLE(OILPAN)
+    // TODO: Decide to add following element to check persistent.
+    void* persistents[1][5];
+#endif
 };
 
 CSSStyleDeclaration& ElementRareData::ensureInlineCSSStyleDeclaration(Element* ownerElement)