Measure usage of MediaStream.prototype.active

third_party/WebKit/Source/modules/mediastream/MediaStream.idl

 /*
  * Copyright (C) 2011 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 25 matching lines @@
 
     sequence<MediaStreamTrack> getAudioTracks();
     sequence<MediaStreamTrack> getVideoTracks();
     sequence<MediaStreamTrack> getTracks();
 
     [RaisesException] void addTrack(MediaStreamTrack track);
     [RaisesException] void removeTrack(MediaStreamTrack track);
     MediaStreamTrack getTrackById(DOMString trackId);
     [CallWith=ExecutionContext] MediaStream clone();
 
-    readonly attribute boolean active;
+    [Measure] readonly attribute boolean active;
 
     attribute EventHandler onactive;
     attribute EventHandler oninactive;
     //  DEPRECATED
     attribute EventHandler onended;
 
     attribute EventHandler onaddtrack;
     attribute EventHandler onremovetrack;
 };