Reland of Uses the activedescendant_changed event received from Blink to fire the right focus event

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 <stdint.h>
 
 #include <memory>
@@ skipping 267 matching lines @@
 
   // Return the object that has focus, starting at the top of the frame tree.
   virtual BrowserAccessibility* GetFocus();
 
   // Return the object that has focus, only considering this frame and
   // descendants.
   BrowserAccessibility* GetFocusFromThisOrDescendantFrame();
 
   // Given a focused node |focus|, returns a descendant of that node if it
   // has an active descendant, otherwise returns |focus|.
-  BrowserAccessibility* GetActiveDescendantFocus(BrowserAccessibility* focus);
+  BrowserAccessibility* GetActiveDescendant(BrowserAccessibility* focus);
 
   // Returns true if native focus is anywhere in this WebContents or not.
   bool NativeViewHasFocus();
 
   // True by default, but some platforms want to treat the root
   // scroll offsets separately.
   virtual bool UseRootScrollOffsetsWhenComputingBounds();
 
   // Walk the tree.
   static BrowserAccessibility* NextInTreeOrder(
@@ skipping 139 matching lines @@
   // node within that parent tree. It's computed as needed and cached for
   // speed so that it can be accessed quickly if it hasn't changed.
   int parent_node_id_from_parent_tree_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_H_