Stop disabling force_compositing_mode for background RenderViews.

extensions/browser/extension_host.cc

 // Copyright 2014 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 "extensions/browser/extension_host.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 409 matching lines @@
 }
 
 void ExtensionHost::RequestMediaAccessPermission(
     content::WebContents* web_contents,
     const content::MediaStreamRequest& request,
     const content::MediaResponseCallback& callback) {
   delegate_->ProcessMediaAccessRequest(
       web_contents, request, callback, extension());
 }
 
+bool ExtensionHost::IsNeverVisible(content::WebContents* web_contents) {
+  ViewType view_type = extensions::GetViewType(web_contents);
+  return view_type == extensions::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE;
+}
+
 }  // namespace extensions