Update desktop tree when Aura windows are removed.

chrome/browser/ui/aura/accessibility/automation_manager_aura.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 CHROME_BROWSER_UI_AURA_ACCESSIBILITY_AUTOMATION_MANAGER_AURA_H_
 #define CHROME_BROWSER_UI_AURA_ACCESSIBILITY_AUTOMATION_MANAGER_AURA_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "chrome/browser/extensions/api/automation_internal/automation_action_adapter.h"
 #include "chrome/browser/ui/aura/accessibility/ax_tree_source_aura.h"
 #include "ui/accessibility/ax_tree_serializer.h"
+#include "ui/views/accessibility/ax_aura_obj_cache.h"
 
 namespace base {
 template <typename T>
 struct DefaultSingletonTraits;
 }  // namespace base
 
 namespace content {
 class BrowserContext;
 }  // namespace content
 
 namespace views {
 class AXAuraObjWrapper;
 class View;
 }  // namespace views
 
 using AuraAXTreeSerializer =
     ui::AXTreeSerializer<views::AXAuraObjWrapper*,
                          ui::AXNodeData,
                          ui::AXTreeData>;
 
 // Manages a tree of automation nodes.
-class AutomationManagerAura : public extensions::AutomationActionAdapter {
+class AutomationManagerAura : public extensions::AutomationActionAdapter,
+                              views::AXAuraObjCache::Delegate {
  public:
   // Get the single instance of this class.
   static AutomationManagerAura* GetInstance();
 
   // Enable automation support for views.
   void Enable(content::BrowserContext* context);
 
   // Disable automation support for views.
   void Disable();
 
   // Handle an event fired upon a |View|.
   void HandleEvent(content::BrowserContext* context,
                    views::View* view,
                    ui::AXEvent event_type);
 
   void HandleAlert(content::BrowserContext* context, const std::string& text);
 
   // AutomationActionAdapter implementation.
   void DoDefault(int32_t id) override;
   void Focus(int32_t id) override;
   void MakeVisible(int32_t id) override;
   void SetSelection(int32_t anchor_id,
                     int32_t anchor_offset,
                     int32_t focus_id,
                     int32_t focus_offset) override;
   void ShowContextMenu(int32_t id) override;
 
+  // views::AXAuraObjCache::Delegate implementation.
+  void OnChildWindowRemoved(views::AXAuraObjWrapper* parent) override;
+
  private:
   friend struct base::DefaultSingletonTraits<AutomationManagerAura>;
 
   AutomationManagerAura();
   virtual ~AutomationManagerAura();
 
   // Reset all state in this manager.
   void ResetSerializer();
 
   void SendEvent(content::BrowserContext* context,
@@ skipping 13 matching lines @@
   std::unique_ptr<AuraAXTreeSerializer> current_tree_serializer_;
 
   bool processing_events_;
 
   std::vector<std::pair<views::AXAuraObjWrapper*, ui::AXEvent>> pending_events_;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationManagerAura);
 };
 
 #endif  // CHROME_BROWSER_UI_AURA_ACCESSIBILITY_AUTOMATION_MANAGER_AURA_H_