Update browser cache of accessibility tree on renderer sub-tree changes....

chrome/browser/renderer_host/render_widget_host_view.h

 // Copyright (c) 2010 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_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #pragma once
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
 #endif
 
+#include <string>
+#include <vector>
+
 #include "app/surface/transport_dib.h"
 #include "gfx/native_widget_types.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebPopupType.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebTextInputType.h"
 
 namespace gfx {
 class Rect;
 class Size;
 }
@@ skipping 219 matching lines @@
   const SkBitmap& background() const { return background_; }
 
   // Returns true if the native view, |native_view|, is contained within in the
   // widget associated with this RenderWidgetHostView.
   virtual bool ContainsNativeView(gfx::NativeView native_view) const = 0;
 
   virtual void UpdateAccessibilityTree(
       const webkit_glue::WebAccessibility& tree) { }
   virtual void OnAccessibilityFocusChange(int acc_obj_id) { }
   virtual void OnAccessibilityObjectStateChange(int acc_obj_id) { }
+  virtual void OnAccessibilityObjectChildrenChange(
+       const std::vector<webkit_glue::WebAccessibility>& acc_changes) { }
 
  protected:
   // Interface class only, do not construct.
   RenderWidgetHostView() : popup_type_(WebKit::WebPopupTypeNone) {}
 
   // Whether this view is a popup and what kind of popup it is (select,
   // autofill...).
   WebKit::WebPopupType popup_type_;
 
   // A custom background to paint behind the web content. This will be tiled
   // horizontally. Can be null, in which case we fall back to painting white.
   SkBitmap background_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostView);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_