Web MIDI: introduce WebMIDIClient API to request a permission

Source/modules/webmidi/MIDIAccess.h

 /*
  * Copyright (C) 2013 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 43 matching lines @@
 
     MIDIInputVector inputs() const { return m_inputs; }
     MIDIOutputVector outputs() const { return m_outputs; }
 
     using RefCounted<MIDIAccess>::ref;
     using RefCounted<MIDIAccess>::deref;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(connect);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(disconnect);
 
+    void enableSysEx(bool enable);
+
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE { return eventNames().interfaceForMIDIAccess; }
     virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE { return ActiveDOMObject::scriptExecutionContext(); }
 
     // ActiveDOMObject
     virtual bool canSuspend() const OVERRIDE { return true; }
     virtual void stop();
 
     // MIDIAccessorClient
     virtual void didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version) OVERRIDE;
     virtual void didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version) OVERRIDE;
-    virtual void didAllowAccess() OVERRIDE;
-    virtual void didBlockAccess() OVERRIDE;
+    virtual void didStartSession() OVERRIDE;
     virtual void didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp) OVERRIDE;
 
 private:
     explicit MIDIAccess(ScriptExecutionContext*, MIDIAccessPromise*);
 
+    void startRequest();
+    virtual void permissionDenied();
+
     // EventTarget
     virtual void refEventTarget() OVERRIDE { ref(); }
     virtual void derefEventTarget() OVERRIDE { deref(); }
     virtual EventTargetData* eventTargetData() OVERRIDE { return &m_eventTargetData; }
     virtual EventTargetData* ensureEventTargetData() OVERRIDE { return &m_eventTargetData; }
 
     MIDIInputVector m_inputs;
     MIDIOutputVector m_outputs;
     EventTargetData m_eventTargetData;
     MIDIAccessPromise* m_promise;
 
     OwnPtr<MIDIAccessor> m_accessor;
     bool m_hasAccess;
+    bool m_enableSysEx;
+    bool m_requesting;
 };
 
 } // namespace WebCore
 
 #endif // MIDIAccess_h