Add getUserSelectedDevices to the USB extensions API.

extensions/browser/api/extensions_api_client.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_EXTENSIONS_API_CLIENT_H_
 #define EXTENSIONS_BROWSER_API_EXTENSIONS_API_CLIENT_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 80 matching lines @@
   // Creates a delegate for WebRequestEventRouter.
   virtual WebRequestEventRouterDelegate* CreateWebRequestEventRouterDelegate()
       const;
 
   // TODO(wjmaclean): Remove this when (if) ContentRulesRegistry code moves
   // to extensions/browser/api.
   virtual scoped_refptr<ContentRulesRegistry> CreateContentRulesRegistry(
       content::BrowserContext* browser_context,
       RulesCacheDelegate* cache_delegate) const;
 
+  // Creates a DevicePermissionsPrompt appropriate for the embedder.
+  virtual scoped_ptr<DevicePermissionsPrompt> CreateDevicePermissionsPrompt(
+      content::WebContents* web_contents) const;
+
   // NOTE: If this interface gains too many methods (perhaps more than 20) it
   // should be split into one interface per API.
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_EXTENSIONS_API_CLIENT_H_