Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/html/track/TextTrackCue.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 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 // https://html.spec.whatwg.org/#texttrackcue
 
 [
     SetWrapperReferenceFrom=owner,
 ] interface TextTrackCue : EventTarget {
-    readonly attribute TextTrack? track;
+    [Measure] readonly attribute TextTrack? track;
 
-    attribute DOMString id;
-    attribute double startTime;
-    attribute double endTime;
-    attribute boolean pauseOnExit;
+    [Measure] attribute DOMString id;
+    [Measure] attribute double startTime;
+    [Measure] attribute double endTime;
+    [Measure] attribute boolean pauseOnExit;
 
-    attribute EventHandler onenter;
-    attribute EventHandler onexit;
+    [Measure] attribute EventHandler onenter;
+    [Measure] attribute EventHandler onexit;
 };