Hook up guest browser plugins to the accessibility tree.

content/renderer/accessibility/renderer_accessibility_complete.cc

 // 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.
 
 #include "content/renderer/accessibility/renderer_accessibility_complete.h"
 
 #include <queue>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 190 matching lines @@
     // When we get a "selected children changed" event, Blink
     // doesn't also send us events for each child that changed
     // selection state, so make sure we re-send that whole subtree.
     if (event.event_type ==
         ui::AX_EVENT_SELECTED_CHILDREN_CHANGED) {
       serializer_.DeleteClientSubtree(obj);
     }
 
     AccessibilityHostMsg_EventParams event_msg;
     tree_source_.CollectChildFrameIdMapping(
-        &event_msg.node_to_frame_routing_id_map);
+        &event_msg.node_to_frame_routing_id_map,
+        &event_msg.node_to_browser_plugin_instance_id_map);
     event_msg.event_type = event.event_type;
     event_msg.id = event.id;
     serializer_.SerializeChanges(obj, &event_msg.update);
     event_msgs.push_back(event_msg);
 
     // For each node in the update, set the location in our map from
     // ids to locations.
     for (size_t i = 0; i < event_msg.update.nodes.size(); ++i) {
       locations_[event_msg.update.nodes[i].id] =
           event_msg.update.nodes[i].location;
@@ skipping 189 matching lines @@
     render_frame_->GetRenderView()->GetWebView()->clearFocusedElement();
   else
     obj.setFocused(true);
 }
 
 void RendererAccessibilityComplete::OnFatalError() {
   CHECK(false) << "Invalid accessibility tree.";
 }
 
 }  // namespace content