Add UseCounter feature for requestMidiAccess with sysex:true

third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp

Index: third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
diff --git a/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp b/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
index 2065ee40a922ee66f691714e8cc5daa1a63af39a..51e2046afecff79fe1f6969bbd69027cc9ce3a63 100644
--- a/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
+++ b/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
@@ -79,9 +79,14 @@ ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* 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);
 }