Add metrics for usage of permission features from iframes in blink

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 982f09ed13f8110d80740552e897a1500cb42499..0b1935edeab4acbcd705143644b88fb57ac484cc 100644
--- a/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
+++ b/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
@@ -36,6 +36,7 @@
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
+#include "core/frame/UseCounter.h"
 #include "modules/webmidi/MIDIAccessInitializer.h"
 #include "modules/webmidi/MIDIOptions.h"
 
@@ -82,6 +83,7 @@ ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* scriptState, cons
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(AbortError, "The frame is not working."));
     }
 
+    UseCounter::countCrossOriginIframe(*frame()->document(), UseCounter::RequestMIDIAccessIframe);
     return MIDIAccessInitializer::start(scriptState, options);
 }