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

ui/views/accessibility/ax_aura_obj_cache.h

Index: ui/views/accessibility/ax_aura_obj_cache.h
diff --git a/ui/views/accessibility/ax_aura_obj_cache.h b/ui/views/accessibility/ax_aura_obj_cache.h
index 6e5d9e829a9b957abe5034b17905bab227bd136f..a8316b5b82182bfba868e3b4e11b3732dd33e651 100644
--- a/ui/views/accessibility/ax_aura_obj_cache.h
+++ b/ui/views/accessibility/ax_aura_obj_cache.h
@@ -52,6 +52,9 @@ class VIEWS_EXPORT AXAuraObjCache {
   // 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>;
 
@@ -75,6 +78,9 @@ class VIEWS_EXPORT AXAuraObjCache {
   std::map<int32, AXAuraObjWrapper*> cache_;
   int32 current_id_;
 
+  // True immediately when entering this object's destructor.
+  bool is_destroying_;
+
   DISALLOW_COPY_AND_ASSIGN(AXAuraObjCache);
 };