Fire accessibility focus/blur events on root web document.

content/browser/accessibility/browser_accessibility_manager.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_H_
 
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 66 matching lines @@
   BrowserAccessibility* GetRoot();
 
   // Removes a node from the manager.
   virtual void RemoveNode(BrowserAccessibility* node);
 
   // Return a pointer to the object corresponding to the given renderer_id,
   // does not make a new reference.
   BrowserAccessibility* GetFromRendererID(int32 renderer_id);
 
   // Called to notify the accessibility manager that its associated native
-  // view got focused. This implies that it is shown (opposite of WasHidden,
-  // below).
-  // The touch_event_context parameter indicates that we were called in the
-  // context of a touch event.
-  void GotFocus(bool touch_event_context);
+  // view got focused.
+  virtual void OnWindowFocused();
 
   // Called to notify the accessibility manager that its associated native
-  // view was hidden. When it's no longer hidden, GotFocus will be called.
-  void WasHidden();
+  // view lost focus.

[David Tseng, 2014/04/02 22:05:05]

nit: View.
Also, what view?

+  virtual void OnWindowBlurred();
 
   // Called to notify the accessibility manager that a mouse down event
   // occurred in the tab.
   void GotMouseDown();
 
   // Update the focused node to |node|, which may be null.
   // If |notify| is true, send a message to the renderer to set focus
   // to this node.
   void SetFocus(BrowserAccessibility* node, bool notify);
 
@@ skipping 134 matching lines @@
 
   // A mapping from renderer IDs to BrowserAccessibility objects.
   base::hash_map<int32, BrowserAccessibility*> renderer_id_map_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_H_