Oilpan: Prepare to move AXObjectCache to the heap

Source/modules/accessibility/AXObjectCacheImpl.h

Index: Source/modules/accessibility/AXObjectCacheImpl.h
diff --git a/Source/modules/accessibility/AXObjectCacheImpl.h b/Source/modules/accessibility/AXObjectCacheImpl.h
index acff085d22a73ffc4ef977d868ba7a43d8eb3210..2e7213a6e93281ad88eff24ef29209439e15b0d1 100644
--- a/Source/modules/accessibility/AXObjectCacheImpl.h
+++ b/Source/modules/accessibility/AXObjectCacheImpl.h
@@ -55,15 +55,19 @@ struct TextMarkerData {
 
 // This class should only be used from inside the accessibility directory.
 class MODULES_EXPORT AXObjectCacheImpl : public AXObjectCache {
-    WTF_MAKE_NONCOPYABLE(AXObjectCacheImpl); WTF_MAKE_FAST_ALLOCATED(AXObjectCacheImpl);
+    WTF_MAKE_NONCOPYABLE(AXObjectCacheImpl);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(AXObjectCacheImpl);
 public:
-    static PassOwnPtr<AXObjectCache> create(Document&);
+    static PassOwnPtrWillBeRawPtr<AXObjectCache> create(Document&);
 
     explicit AXObjectCacheImpl(Document&);
     ~AXObjectCacheImpl();
+    DECLARE_VIRTUAL_TRACE();
 
     AXObject* focusedUIElementForPage(const Page*);
 
+    virtual void dispose() override;
+
     virtual void selectionChanged(Node*) override;
     virtual void childrenChanged(Node*) override;
     virtual void childrenChanged(LayoutObject*) override;
@@ -188,6 +192,38 @@ private:
 
     HashSet<AXID> m_idsInUse;
 
+#if ENABLE(ASSERT)
+    // Verified when finalizing.
+    bool m_hasBeenDisposed;
+#endif
+
+    //
+    // Aria-owns
+    //
+
+    // Map from the AXID of the owner to the AXIDs of the children.
+    // This is a validated map, it doesn't contain illegal, duplicate,
+    // or cyclical matches, or references to IDs that don't exist.
+    HashMap<AXID, Vector<AXID>> m_ariaOwnerToChildrenMapping;
+
+    // Map from the AXID of a child to the AXID of the parent that owns it.
+    HashMap<AXID, AXID> m_ariaOwnedChildToOwnerMapping;
+
+    // Map from the AXID of a child to the AXID of its real parent in the tree if
+    // we ignored aria-owns. This is needed in case the owner no longer wants to own it.
+    HashMap<AXID, AXID> m_ariaOwnedChildToRealParentMapping;
+
+    // Map from the AXID of any object with an aria-owns attribute to the set of ids
+    // of its children. This is *unvalidated*, it includes ids that may not currently
+    // exist in the tree.
+    HashMap<AXID, HashSet<String>> m_ariaOwnerToIdsMapping;
+
+    // Map from an ID (the ID attribute of a DOM element) to the set of elements that
+    // want to own that ID. This is *unvalidated*, it includes possible duplicates.
+    // This is used so that when an element with an ID is added to the tree or changes
+    // its ID, we can quickly determine if it affects an aria-owns relationship.
+    HashMap<String, OwnPtr<HashSet<AXID>>> m_idToAriaOwnersMapping;
+
     Timer<AXObjectCacheImpl> m_notificationPostTimer;
     Vector<pair<RefPtr<AXObject>, AXNotification>> m_notificationsToPost;
     void notificationPostTimerFired(Timer<AXObjectCacheImpl>*);