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

Source/core/dom/ElementRareData.h

Index: Source/core/dom/ElementRareData.h
diff --git a/Source/core/dom/ElementRareData.h b/Source/core/dom/ElementRareData.h
index 631fc87e185c37584335185b1651808006ec640b..0840ad7f9eb34742c6435c3e5e02d08dc7481618 100644
--- a/Source/core/dom/ElementRareData.h
+++ b/Source/core/dom/ElementRareData.h
@@ -32,6 +32,7 @@
 #include "core/html/ClassList.h"
 #include "core/html/ime/InputMethodContext.h"
 #include "core/rendering/style/StyleInheritedData.h"
+#include "platform/heap/Handle.h"
 #include "wtf/OwnPtr.h"
 
 namespace WebCore {
@@ -85,7 +86,7 @@ public:
     void clearComputedStyle() { m_computedStyle = nullptr; }
 
     ClassList* classList() const { return m_classList.get(); }
-    void setClassList(PassOwnPtr<ClassList> classList) { m_classList = classList; }
+    void setClassList(PassOwnPtrWillBeRawPtr<ClassList> classList) { m_classList = classList; }
     void clearClassListValueForQuirksMode()
     {
         if (!m_classList)
@@ -94,7 +95,7 @@ public:
     }
 
     DatasetDOMStringMap* dataset() const { return m_dataset.get(); }
-    void setDataset(PassOwnPtr<DatasetDOMStringMap> dataset) { m_dataset = dataset; }
+    void setDataset(PassOwnPtrWillBeRawPtr<DatasetDOMStringMap> dataset) { m_dataset = dataset; }
 
     LayoutSize minimumSizeForResizing() const { return m_minimumSizeForResizing; }
     void setMinimumSizeForResizing(LayoutSize size) { m_minimumSizeForResizing = size; }
@@ -122,14 +123,18 @@ public:
     void setCustomElementDefinition(PassRefPtr<CustomElementDefinition> definition) { m_customElementDefinition = definition; }
     CustomElementDefinition* customElementDefinition() const { return m_customElementDefinition.get(); }
 
+    void trace(Visitor*);
+
 private:
     short m_tabindex;
 
     LayoutSize m_minimumSizeForResizing;
     IntSize m_savedLayerScrollOffset;
 
-    OwnPtr<DatasetDOMStringMap> m_dataset;
-    OwnPtr<ClassList> m_classList;
+    GC_PLUGIN_IGNORE("340522")

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

We should work on this bug report. It might be nice to move RareData to the heap
first as Erik suggests?

+    OwnPtrWillBeMember<DatasetDOMStringMap> m_dataset;
+    GC_PLUGIN_IGNORE("340522")
+    OwnPtrWillBeMember<ClassList> m_classList;
     OwnPtr<ElementShadow> m_shadow;
     OwnPtr<NamedNodeMap> m_attributeMap;
     OwnPtr<InputMethodContext> m_inputMethodContext;