Propagate opener to BackgroundsContents.

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 27 matching lines @@
   bool IsNeverVisible(content::WebContents* web_contents) override;
   void CloseContents(content::WebContents* source) override;
   bool ShouldSuppressDialogs(content::WebContents* source) override;
   bool ShouldFocusPageAfterCrash() override;
   void CanDownload(const GURL& url,
                    const std::string& request_method,
                    const base::Callback<void(bool)>& callback) override;
 
   bool ShouldCreateWebContents(
       content::WebContents* web_contents,
+      content::RenderFrameHost* opener,
       content::SiteInstance* source_site_instance,
       int32_t route_id,
       int32_t main_frame_route_id,
       int32_t main_frame_widget_route_id,
       content::mojom::WindowContainerType window_container_type,
       const GURL& opener_url,
       const std::string& frame_name,
       const GURL& target_url,
       const std::string& partition_id,
       content::SessionStorageNamespace* session_storage_namespace) override;
@@ skipping 24 matching lines @@
   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_