Improve support for multiselect list box accessibility on Windows.

content/renderer/renderer_accessibility.cc

 // Copyright (c) 2011 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 "base/command_line.h"
 #include "content/common/view_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/renderer_accessibility.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAccessibilityObject.h"
@@ skipping 399 matching lines @@
     render_view()->GetWebView()->clearFocusedNode();
   else
     obj.setFocused(true);
 }
 
 bool RendererAccessibility::ShouldIncludeChildren(
     const RendererAccessibility::Notification& notification) {
   WebKit::WebAccessibilityNotification type = notification.type;
   if (type == WebKit::WebAccessibilityNotificationChildrenChanged ||
       type == WebKit::WebAccessibilityNotificationLoadComplete ||
-      type == WebKit::WebAccessibilityNotificationLiveRegionChanged) {
+      type == WebKit::WebAccessibilityNotificationLiveRegionChanged ||
+      type == WebKit::WebAccessibilityNotificationSelectedChildrenChanged) {
     return true;
   }
   return false;
 }
 
 WebDocument RendererAccessibility::GetMainDocument() {
   WebView* view = render_view()->GetWebView();
   WebFrame* main_frame = view ? view->mainFrame() : NULL;
 
   if (main_frame)
     return main_frame->document();
   else
     return WebDocument();
 }