[Blink, RemotePlayback] watchAvailability() implementation.

third_party/WebKit/Source/modules/remoteplayback/HTMLMediaElementRemotePlayback.h

 // Copyright 2015 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 HTMLMediaElementRemotePlayback_h
 #define HTMLMediaElementRemotePlayback_h
 
 #include "modules/ModulesExport.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class HTMLMediaElement;
 class QualifiedName;
 class RemotePlayback;
+class ScriptState;
 
 // Class used to implement the Remote Playback API. It is a supplement to
 // HTMLMediaElement.
 class HTMLMediaElementRemotePlayback final
     : public GarbageCollected<HTMLMediaElementRemotePlayback>,
       public Supplement<HTMLMediaElement> {
   USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementRemotePlayback);
 
  public:
   static bool fastHasAttribute(const QualifiedName&, const HTMLMediaElement&);
   static void setBooleanAttribute(const QualifiedName&,
                                   HTMLMediaElement&,
                                   bool);
 
   static HTMLMediaElementRemotePlayback& from(HTMLMediaElement&);
-  static RemotePlayback* remote(HTMLMediaElement&);
+  static RemotePlayback* remote(ScriptState*, HTMLMediaElement&);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   static const char* supplementName();
 
   Member<RemotePlayback> m_remote;
 };
 
 }  // namespace blink
 
 #endif  // HTMLMediaElementRemotePlayback_h