Stop disabling force_compositing_mode for background RenderViews.

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/chrome_notification_types.h"
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 105 matching lines @@
 void BackgroundContents::AddNewContents(WebContents* source,
                                         WebContents* new_contents,
                                         WindowOpenDisposition disposition,
                                         const gfx::Rect& initial_pos,
                                         bool user_gesture,
                                         bool* was_blocked) {
   delegate_->AddWebContents(
       new_contents, disposition, initial_pos, user_gesture, was_blocked);
 }
 
+bool BackgroundContents::IsNeverVisible(content::WebContents* web_contents) {
+  DCHECK_EQ(extensions::VIEW_TYPE_BACKGROUND_CONTENTS,
+            extensions::GetViewType(web_contents));
+  return true;
+}
+
 void BackgroundContents::RenderProcessGone(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
   // via the TaskManager doesn't permanently leave a BackgroundContents hanging
   // around the system, blocking future instances from being created
   // <http://crbug.com/65189>.
   delete this;
 }
 
 void BackgroundContents::Observe(int type,
                                  const content::NotificationSource& source,
                                  const content::NotificationDetails& details) {
   // TODO(rafaelw): Implement pagegroup ref-counting so that non-persistent
   // background pages are closed when the last referencing frame is closed.
   switch (type) {
     case chrome::NOTIFICATION_PROFILE_DESTROYED:
     case chrome::NOTIFICATION_APP_TERMINATING: {
       delete this;
       break;
     }
     default:
       NOTREACHED() << "Unexpected notification sent.";
       break;
   }
 }