[Offline pages] Create offliner that uses background loader

components/offline_pages/content/background_loader/background_loader_contents.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_OFFLINE_PAGES_CONTENT_BACKGROUND_LOADER_BACKGROUND_LOADER_CONTENTS_H_
 #define COMPONENTS_OFFLINE_PAGES_CONTENT_BACKGROUND_LOADER_BACKGROUND_LOADER_CONTENTS_H_
 
 #include <string>
 
 #include "content/public/browser/web_contents_delegate.h"
@@ skipping 57 matching lines @@
   void RequestMediaAccessPermission(
       content::WebContents* contents,
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback) override;
   bool CheckMediaAccessPermission(content::WebContents* contents,
                                   const GURL& security_origin,
                                   content::MediaStreamType type) override;
 
  private:
   friend class BackgroundLoaderContentsTest;
+  friend class BackgroundLoaderContentsStub;
+
   BackgroundLoaderContents();
 
   std::unique_ptr<content::WebContents> web_contents_;
   content::BrowserContext* browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundLoaderContents);
 };
 
 }  // namespace background_loader
 #endif  // COMPONENTS_OFFLINE_PAGES_CONTENT_BACKGROUND_LOADER_BACKGROUND_LOADER_CONTENTS_H_