Attach a WebBluetooth to the LocalFrame and use it if it's available.

public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
 #include "public/platform/WebURLError.h"
 #include "public/platform/WebURLRequest.h"
 #include <v8.h>
 
 namespace blink {
 
 enum class WebTreeScopeType;
 class WebApplicationCacheHost;
 class WebApplicationCacheHostClient;
 class WebAppBannerClient;
+class WebBluetooth;
 class WebCachedURLRequest;
 class WebColorChooser;
 class WebColorChooserClient;
 class WebContentDecryptionModule;
 class WebCookieJar;
 class WebDataSource;
 class WebEncryptedMediaClient;
 class WebExternalPopupMenu;
 class WebExternalPopupMenuClient;
 class WebFormElement;
@@ skipping 589 matching lines @@
 
     // Unregisters a given URL handler for the given protocol.
     virtual void unregisterProtocolHandler(const WebString& scheme, const WebURL& url) { }
 
     // Check if a given URL handler is registered for the given protocol.
     virtual WebCustomHandlersState isProtocolHandlerRegistered(const WebString& scheme, const WebURL& url)
     {
         return WebCustomHandlersNew;
     }
 
+    // Bluetooth -----------------------------------------------------------
+    virtual WebBluetooth* bluetooth() { return 0; }
+
 protected:
     virtual ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif