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

chrome/common/notification_type.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_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 #pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
@@ skipping 413 matching lines @@
     // time. The source will be the RenderWidgetHost that corresponds to the
     // hung view, and no details are expected.
     RENDERER_PROCESS_HANG,
 
     // This is sent to notify that the RenderViewHost displayed in a
     // TabContents has changed.  Source is the TabContents for which the change
     // happened, details is the previous RenderViewHost (can be NULL when the
     // first RenderViewHost is set).
     RENDER_VIEW_HOST_CHANGED,
 
-    // Indicates that the render view host has received a new accessibility tree
-    // from the render view.  The source is the RenderViewHost, the details
-    // are not used.
+    // Indicates that the render view host has received an accessibility tree
+    // update, either partial or full, from the render view.  The source is the
+    // RenderViewHost, the details are not used.
     RENDER_VIEW_HOST_ACCESSIBILITY_TREE_UPDATED,
 
     // This is sent when a RenderWidgetHost is being destroyed. The source is
     // the RenderWidgetHost, the details are not used.
     RENDER_WIDGET_HOST_DESTROYED,
 
     // Sent from ~RenderViewHost. The source is the TabContents.
     RENDER_VIEW_HOST_DELETED,
 
     // Sent from RenderViewHost::ClosePage.  The hosted RenderView has
@@ skipping 717 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_