Add UseCounter feature for requestMidiAccess with sysex:true

third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.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 61 matching lines @@
 }
 
 ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* script_state,
                                                   const MIDIOptions& options) {
   if (!script_state->ContextIsValid()) {
     return ScriptPromise::RejectWithDOMException(
         script_state,
         DOMException::Create(kAbortError, "The frame is not working."));
   }
 
-  UseCounter::CountCrossOriginIframe(
-      *ToDocument(ExecutionContext::From(script_state)),
-      UseCounter::kRequestMIDIAccessIframe);
+  Document& document = *ToDocument(ExecutionContext::From(script_state));
+  if (options.hasSysex() && options.sysex()) {

[Takashi Toyoshima, 2017/04/18 07:06:28]

optional: I slightly prefer following names.
 - kRequestMIDIAccessWithSysExOption
 - kRequestMIDIAccessIframeWithSysExOption

[Timothy Loh, 2017/04/18 07:30:13]

Done.

+    UseCounter::Count(document, UseCounter::kRequestMIDIAccessSysEx);
+    UseCounter::CountCrossOriginIframe(
+        document, UseCounter::kRequestMIDIAccessSysExIframe);
+  }
+  UseCounter::CountCrossOriginIframe(document,
+                                     UseCounter::kRequestMIDIAccessIframe);
   return MIDIAccessInitializer::Start(script_state, options);
 }
 
 }  // namespace blink