Reland #2: Ensure WebView notifies desktop automation on creation, destruction, and change Original

ui/views/accessibility/ax_aura_obj_cache.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_
 #define UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 34 matching lines @@
   void Remove(View* view);
   void Remove(Widget* widget);
   void Remove(aura::Window* window);
 
   // Lookup a cached entry based on an id.
   AXAuraObjWrapper* Get(int32 id);
 
   // Remove a cached entry based on an id.
   void Remove(int32 id);
 
+  // Indicates if this object's currently being destroyed.
+  bool is_destroying() { return is_destroying_; }
+
  private:
   friend struct DefaultSingletonTraits<AXAuraObjCache>;
 
   AXAuraObjCache();
   virtual ~AXAuraObjCache();
 
   template <typename AuraViewWrapper, typename AuraView>
       AXAuraObjWrapper* CreateInternal(
           AuraView* aura_view, std::map<AuraView*, int32>& aura_view_to_id_map);
 
   template<typename AuraView> int32 GetIDInternal(
       AuraView* aura_view, std::map<AuraView*, int32>& aura_view_to_id_map);
 
   template<typename AuraView> void RemoveInternal(
       AuraView* aura_view, std::map<AuraView*, int32>& aura_view_to_id_map);
 
   std::map<views::View*, int32> view_to_id_map_;
   std::map<views::Widget*, int32> widget_to_id_map_;
   std::map<aura::Window*, int32> window_to_id_map_;
 
   std::map<int32, AXAuraObjWrapper*> cache_;
   int32 current_id_;
 
+  // True immediately when entering this object's destructor.
+  bool is_destroying_;
+
   DISALLOW_COPY_AND_ASSIGN(AXAuraObjCache);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_