Add the main frame routing ID to WebContentsDelegate, use it in BackgroundContents.

chrome/browser/background/background_contents_service.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/background/background_contents_service.h"
 
 #include "apps/app_load_service.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 604 matching lines @@
   // actions or session restore can take place, so no BackgroundContents should
   // be running yet for the passed application_id.
   DCHECK(!GetAppBackgroundContents(application_id));
   DCHECK(!application_id.empty());
   DCHECK(url.is_valid());
   DVLOG(1) << "Loading background content url: " << url;
 
   BackgroundContents* contents = CreateBackgroundContents(
       SiteInstance::CreateForURL(profile, url),
       MSG_ROUTING_NONE,
+      MSG_ROUTING_NONE,
       profile,
       frame_name,
       application_id,
       std::string(),
       NULL);
 
   // TODO(atwilson): Create RenderViews asynchronously to avoid increasing
   // startup latency (http://crbug.com/47236).
   contents->web_contents()->GetController().LoadURL(
       url, content::Referrer(), ui::PAGE_TRANSITION_LINK, std::string());
 }
 
 BackgroundContents* BackgroundContentsService::CreateBackgroundContents(
     SiteInstance* site,
     int routing_id,
+    int main_frame_route_id,
     Profile* profile,
     const base::string16& frame_name,
     const base::string16& application_id,
     const std::string& partition_id,
     content::SessionStorageNamespace* session_storage_namespace) {
   BackgroundContents* contents = new BackgroundContents(
-      site, routing_id, this, partition_id, session_storage_namespace);
+      site, routing_id, main_frame_route_id, this, partition_id,
+      session_storage_namespace);
 
   // Register the BackgroundContents internally, then send out a notification
   // to external listeners.
   BackgroundContentsOpenedDetails details = {contents,
                                              frame_name,
                                              application_id};
   BackgroundContentsOpened(&details, profile);
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_BACKGROUND_CONTENTS_OPENED,
       content::Source<Profile>(profile),
@@ skipping 110 matching lines @@
     bool user_gesture,
     bool* was_blocked) {
   Browser* browser = chrome::FindLastActiveWithProfile(
       Profile::FromBrowserContext(new_contents->GetBrowserContext()),
       chrome::GetActiveDesktop());
   if (browser) {
     chrome::AddWebContents(browser, NULL, new_contents, disposition,
                            initial_pos, user_gesture, was_blocked);
   }
 }