Web MIDI: introduce WebMIDIClient API to request a permission

Source/modules/webmidi/MIDIAccess.cpp

 /*
  * 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 48 matching lines @@
 MIDIAccess::MIDIAccess(ScriptExecutionContext* context, MIDIAccessPromise* promise)
     : ActiveDOMObject(context)
     , m_promise(promise)
     , m_hasAccess(false)
 {
     ScriptWrappable::init(this);
     m_accessor = MIDIAccessor::create(this);
     m_accessor->requestAccess(promise->options()->sysex);
 }
 
+SecurityOrigin* MIDIAccess::securityOrigin() const
+{
+    return scriptExecutionContext()->securityOrigin();
+}
+
 void MIDIAccess::didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version)
 {
     ASSERT(isMainThread());
 
     m_inputs.append(MIDIInput::create(scriptExecutionContext(), id, manufacturer, name, version));
 }
 
 void MIDIAccess::didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version)
 {
     ASSERT(isMainThread());
@@ skipping 34 matching lines @@
         m_inputs[portIndex]->didReceiveMIDIData(portIndex, data, length, timeStampInMilliseconds);
     }
 }
 
 void MIDIAccess::stop()
 {
     m_hasAccess = false;
 }
 
 } // namespace WebCore