Web MIDI: Add a run-time flag in blink

Source/WebKit/chromium/src/WebRuntimeFeatures.cpp

 /*
  * Copyright (C) 2009 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 538 matching lines @@
 void WebRuntimeFeatures::enableExperimentalWebSocket(bool enable)
 {
     RuntimeEnabledFeatures::setExperimentalWebSocketEnabled(enable);
 }
 
 bool WebRuntimeFeatures::isExperimentalWebSocketEnabled()
 {
     return RuntimeEnabledFeatures::experimentalWebSocketEnabled();
 }
 
+void WebRuntimeFeatures::enableWebMIDI(bool enable)
+{
+    return RuntimeEnabledFeatures::setWebMIDIEnabled(enable);
+}
+
+bool WebRuntimeFeatures::isWebMIDIEnabled()
+{
+    return RuntimeEnabledFeatures::webMIDIEnabled();
+}
+
 } // namespace WebKit