Propagate opener to BackgroundsContents.

content/public/browser/web_contents_delegate.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 300 matching lines @@
   //       provisionally-created RenderView (if it exists) in the renderer
   //       process will be destroyed, UNLESS the delegate, during this method,
   //       itself creates a WebContents using |source_site_instance|,
   //       |route_id|, |main_frame_route_id|, and |main_frame_widget_route_id|
   //       as creation parameters. If this happens, the delegate assumes
   //       ownership of the corresponding RenderView, etc. |web_contents| will
   //       detect that this has happened by looking for the existence of a
   //       RenderViewHost in |source_site_instance| with |route_id|.
   virtual bool ShouldCreateWebContents(
       WebContents* web_contents,
+      RenderFrameHost* opener,
       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,
       SessionStorageNamespace* session_storage_namespace);
@@ skipping 244 matching lines @@
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_