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

chrome/browser/extensions/extension_host.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/extensions/extension_host.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
@@ skipping 573 matching lines @@
     dialog_creator_.reset(CreateJavaScriptDialogCreatorInstance(this));
   }
   return dialog_creator_.get();
 }
 
 void ExtensionHost::RunFileChooser(WebContents* tab,
                                    const content::FileChooserParams& params) {
   FileSelectHelper::RunFileChooser(tab, params);
 }
 
-void ExtensionHost::AddNewContents(WebContents* source,
+bool ExtensionHost::AddNewContents(WebContents* source,
                                    WebContents* new_contents,
                                    WindowOpenDisposition disposition,
                                    const gfx::Rect& initial_pos,
                                    bool user_gesture) {
   // First, if the creating extension view was associated with a tab contents,
   // use that tab content's delegate. We must be careful here that the
   // associated tab contents has the same profile as the new tab contents. In
   // the case of extensions in 'spanning' incognito mode, they can mismatch.
   // We don't want to end up putting a normal tab into an incognito window, or
   // vice versa.
   // Note that we don't do this for popup windows, because we need to associate
   // those with their extension_app_id.
   if (disposition != NEW_POPUP) {
     WebContents* associated_contents = GetAssociatedWebContents();
     if (associated_contents &&
         associated_contents->GetBrowserContext() ==
             new_contents->GetBrowserContext()) {
-      associated_contents->AddNewContents(
-          new_contents, disposition, initial_pos, user_gesture);
-      return;
+      WebContentsDelegate* delegate = associated_contents->GetDelegate();
+      return delegate && delegate->AddNewContents(
+          associated_contents, new_contents, disposition, initial_pos,
+          user_gesture);
     }
   }
 
   ExtensionTabUtil::CreateTab(new_contents, extension_id_, disposition,
                               initial_pos, user_gesture);
+  return true;
 }
 
 void ExtensionHost::RenderViewReady() {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_HOST_CREATED,
       content::Source<Profile>(profile_),
       content::Details<ExtensionHost>(this));
 }
 
 }  // namespace extensions