Pass result of blockage across content API when new tab blocked.

chrome/browser/tab_contents/background_contents.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 "chrome/browser/tab_contents/background_contents.h"
 
 #include "chrome/browser/background/background_contents_service.h"
 #include "chrome/browser/extensions/api/messaging/message_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
@@ skipping 76 matching lines @@
   // some way to scope navigation of a background page to its opener's security
   // origin. Note: if the first navigation is to a URL outside the app's
   // extent a background page will be opened but will remain at about:blank.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_BACKGROUND_CONTENTS_NAVIGATED,
       content::Source<Profile>(profile_),
       content::Details<BackgroundContents>(this));
 }
 
 // Forward requests to add a new WebContents to our delegate.
-void BackgroundContents::AddNewContents(WebContents* source,
+bool BackgroundContents::AddNewContents(WebContents* source,
                                         WebContents* new_contents,
                                         WindowOpenDisposition disposition,
                                         const gfx::Rect& initial_pos,
                                         bool user_gesture) {
-  delegate_->AddWebContents(
+  return delegate_->AddWebContents(
       new_contents, disposition, initial_pos, user_gesture);
 }
 
 void BackgroundContents::RenderViewGone(base::TerminationStatus status) {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_BACKGROUND_CONTENTS_TERMINATED,
       content::Source<Profile>(profile_),
       content::Details<BackgroundContents>(this));
 
   // Our RenderView went away, so we should go away also, so killing the process
@@ skipping 12 matching lines @@
     case chrome::NOTIFICATION_PROFILE_DESTROYED:
     case content::NOTIFICATION_APP_TERMINATING: {
       delete this;
       break;
     }
     default:
       NOTREACHED() << "Unexpected notification sent.";
       break;
   }
 }