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

chrome/browser/renderer_host/render_widget_host.cc

 // 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.
 
 #include "chrome/browser/renderer_host/render_widget_host.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/histogram.h"
 #include "base/keyboard_codes.h"
@@ skipping 1135 matching lines @@
 }
 
 void RenderWidgetHost::SetAccessibilityFocus(int acc_obj_id) {
   Send(new ViewMsg_SetAccessibilityFocus(routing_id(), acc_obj_id));
 }
 
 void RenderWidgetHost::AccessibilityDoDefaultAction(int acc_obj_id) {
   Send(new ViewMsg_AccessibilityDoDefaultAction(routing_id(), acc_obj_id));
 }
 
+void RenderWidgetHost::AccessibilityObjectChildrenChangeAck() {
+  Send(new ViewMsg_AccessibilityObjectChildrenChange_ACK(routing_id()));
+}
+
 void RenderWidgetHost::ProcessKeyboardEventAck(int type, bool processed) {
   if (key_queue_.size() == 0) {
     LOG(ERROR) << "Got a KeyEvent back from the renderer but we "
                << "don't seem to have sent it to the renderer!";
   } else if (key_queue_.front().type != type) {
     LOG(ERROR) << "We seem to have a different key type sent from "
                << "the renderer. (" << key_queue_.front().type << " vs. "
                << type << "). Ignoring event.";
 
     // Something must be wrong. Clear the |key_queue_| and
     // |suppress_next_char_events_| so that we can resume from the error.
     key_queue_.clear();
     suppress_next_char_events_ = false;
   } else {
     NativeWebKeyboardEvent front_item = key_queue_.front();
     key_queue_.pop_front();
 
     // We only send unprocessed key event upwards if we are not hidden,
     // because the user has moved away from us and no longer expect any effect
     // of this key event.
     if (!processed && !is_hidden_ && !front_item.skip_in_browser) {
       UnhandledKeyboardEvent(front_item);
 
       // WARNING: This RenderWidgetHost can be deallocated at this point
       // (i.e.  in the case of Ctrl+W, where the call to
       // UnhandledKeyboardEvent destroys this RenderWidgetHost).
     }
   }
 }