Hook up guest browser plugins to the accessibility tree.

content/browser/web_contents/web_contents_impl.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/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1778 matching lines @@
 AccessibilityMode WebContentsImpl::GetAccessibilityMode() const {
   return accessibility_mode_;
 }
 
 void WebContentsImpl::AccessibilityEventReceived(
     const std::vector<AXEventNotificationDetails>& details) {
   FOR_EACH_OBSERVER(
       WebContentsObserver, observers_, AccessibilityEventReceived(details));
 }
 
+RenderFrameHost* WebContentsImpl::GetGuestByInstanceID(
+    int browser_plugin_instance_id) {
+  BrowserPluginGuestManager* guest_manager =
+      GetBrowserContext()->GetGuestManager();
+  WebContents* guest = guest_manager->GetGuestByInstanceID(
+      this, browser_plugin_instance_id);
+  if (!guest)
+    return NULL;
+  return guest->GetMainFrame();
+}
+
 void WebContentsImpl::OnShowValidationMessage(
     const gfx::Rect& anchor_in_root_view,
     const base::string16& main_text,
     const base::string16& sub_text) {
   if (delegate_)
     delegate_->ShowValidationMessage(
         this, anchor_in_root_view, main_text, sub_text);
 }
 
 void WebContentsImpl::OnHideValidationMessage() {
@@ skipping 2525 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content