Additional window features are not passed as a parameter to new popup windows

content/public/browser/content_browser_client.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_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 444 matching lines @@
   // the window that is created should be scriptable/in the same process.
   // This is called on the IO thread.
   virtual bool CanCreateWindow(const GURL& opener_url,
                                const GURL& opener_top_level_frame_url,
                                const GURL& source_origin,
                                WindowContainerType container_type,
                                const GURL& target_url,
                                const content::Referrer& referrer,
                                WindowOpenDisposition disposition,
                                const blink::WebWindowFeatures& features,
+                               const std::vector<string16>& additional_features,

[jam, 2013/11/11 17:07:18]

we should keep the implementation details of no-WebString-over-IPC hidden from
this API. i.e. when you dispatch the IPC from the renderer, create a new
blink::WebWindowFeatures and set the additionalFeatures member to this array

                                bool user_gesture,
                                bool opener_suppressed,
                                content::ResourceContext* context,
                                int render_process_id,
                                bool is_guest,
                                int opener_id,
                                bool* no_javascript_access);
 
   // Returns a title string to use in the task manager for a process host with
   // the given URL, or the empty string to fall back to the default logic.
@@ skipping 127 matching lines @@
   // Returns true if plugin referred to by the url can use
   // pp::FileIO::RequestOSFileHandle.
   virtual bool IsPluginAllowedToCallRequestOSFileHandle(
       content::BrowserContext* browser_context,
       const GURL& url);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_