Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 2ec5030568d72bf231241504aad6fca6d6838811..16763e0cd07379c26d2113d723dd5f302131cf31 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -835,7 +835,7 @@ public:
     void popCurrentScript();
 
     void applyXSLTransform(ProcessingInstruction* pi);
-    PassRefPtr<Document> transformSourceDocument() { return m_transformSourceDocument; }
+    PassRefPtrWillBeRawPtr<Document> transformSourceDocument() { return m_transformSourceDocument; }
     void setTransformSourceDocument(Document* doc) { m_transformSourceDocument = doc; }
 
     void setTransformSource(PassOwnPtr<TransformSource>);
@@ -1027,7 +1027,7 @@ public:
 
     void addToTopLayer(Element*, const Element* before = 0);
     void removeFromTopLayer(Element*);
-    const Vector<RefPtr<Element> >& topLayerElements() const { return m_topLayerElements; }
+    const WillBeHeapVector<RefPtrWillBeMember<Element> >& topLayerElements() const { return m_topLayerElements; }
     HTMLDialogElement* activeModalDialog() const;
 
     // A non-null m_templateDocumentHost implies that |this| was created by ensureTemplateDocument().
@@ -1209,10 +1209,10 @@ private:
     // Mime-type of the document in case it was cloned or created by XHR.
     AtomicString m_mimeType;
 
-    RefPtr<DocumentType> m_docType;
+    RefPtrWillBeMember<DocumentType> m_docType;
     OwnPtr<DOMImplementation> m_implementation;
 
-    RefPtrWillBePersistent<CSSStyleSheet> m_elemSheet;
+    RefPtrWillBeMember<CSSStyleSheet> m_elemSheet;
 
     bool m_printing;
     bool m_paginatedForScreen;
@@ -1222,11 +1222,11 @@ private:
 
     bool m_hasAutofocused;
     Timer<Document> m_clearFocusedElementTimer;
-    RefPtr<Element> m_autofocusElement;
-    RefPtr<Element> m_focusedElement;
-    RefPtr<Node> m_hoverNode;
-    RefPtr<Element> m_activeHoverElement;
-    RefPtr<Element> m_documentElement;
+    RefPtrWillBeMember<Element> m_autofocusElement;
+    RefPtrWillBeMember<Element> m_focusedElement;
+    RefPtrWillBeMember<Node> m_hoverNode;
+    RefPtrWillBeMember<Element> m_activeHoverElement;
+    RefPtrWillBeMember<Element> m_documentElement;
     UserActionElementSet m_userActionElements;
 
     uint64_t m_domTreeVersion;
@@ -1239,7 +1239,7 @@ private:
 
     MutationObserverOptions m_mutationObserverTypes;
 
-    OwnPtrWillBePersistent<StyleEngine> m_styleEngine;
+    OwnPtrWillBeMember<StyleEngine> m_styleEngine;
     RefPtrWillBeMember<StyleSheetList> m_styleSheetList;
 
     OwnPtr<FormController> m_formController;
@@ -1264,7 +1264,7 @@ private:
     String m_title;
     String m_rawTitle;
     bool m_titleSetExplicitly;
-    RefPtr<Element> m_titleElement;
+    RefPtrWillBeMember<Element> m_titleElement;
 
     OwnPtr<AXObjectCache> m_axObjectCache;
     OwnPtr<DocumentMarkerController> m_markers;
@@ -1279,10 +1279,10 @@ private:
 
     OwnPtr<ScriptRunner> m_scriptRunner;
 
-    Vector<RefPtr<HTMLScriptElement> > m_currentScriptStack;
+    WillBeHeapVector<RefPtrWillBeMember<HTMLScriptElement> > m_currentScriptStack;
 
     OwnPtr<TransformSource> m_transformSource;
-    RefPtr<Document> m_transformSourceDocument;
+    RefPtrWillBeMember<Document> m_transformSourceDocument;
 
     String m_xmlEncoding;
     String m_xmlVersion;
@@ -1304,7 +1304,7 @@ private:
     bool m_hasAnnotatedRegions;
     bool m_annotatedRegionsDirty;
 
-    HashMap<String, RefPtr<HTMLCanvasElement> > m_cssCanvasElements;
+    WillBeHeapHashMap<String, RefPtrWillBeMember<HTMLCanvasElement> > m_cssCanvasElements;
 
     OwnPtr<SelectorQueryCache> m_selectorQueryCache;
 
@@ -1324,7 +1324,7 @@ private:
 
     bool m_hasFullscreenElementStack; // For early return in FullscreenElementStack::fromIfExists()
 
-    Vector<RefPtr<Element> > m_topLayerElements;
+    WillBeHeapVector<RefPtrWillBeMember<Element> > m_topLayerElements;
 
     int m_loadEventDelayCount;
     Timer<Document> m_loadEventDelayTimer;
@@ -1370,11 +1370,11 @@ private:
     RefPtr<DocumentTimeline> m_transitionTimeline;
     CompositorPendingAnimations m_compositorPendingAnimations;
 
-    RefPtr<Document> m_templateDocument;
-    Document* m_templateDocumentHost; // Manually managed weakref (backpointer from m_templateDocument).
+    RefPtrWillBeMember<Document> m_templateDocument;
+    RawPtrWillBeMember<Document> m_templateDocumentHost; // Manually managed weakref (backpointer from m_templateDocument).
 
     Timer<Document> m_didAssociateFormControlsTimer;
-    HashSet<RefPtr<Element> > m_associatedFormControls;
+    WillBeHeapHashSet<RefPtrWillBeMember<Element> > m_associatedFormControls;
 
     HashSet<SVGUseElement*> m_useElementsNeedingUpdate;
     HashSet<Element*> m_layerUpdateElements;