Add UseCounters for some (now) non-standard CSS APIs

Source/core/css/StyleMedia.idl

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 10 matching lines @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * 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.
  */
 
 [
     NoInterfaceObject,
     WillBeGarbageCollected
 ] interface StyleMedia {
-    readonly attribute DOMString type;
-    boolean matchMedium([Default=Undefined] optional DOMString mediaquery);
+    [MeasureAs=StyleMediaType] readonly attribute DOMString type;
+    [MeasureAs=StyleMediaMatchMedium] boolean matchMedium([Default=Undefined] optional DOMString mediaquery);
 };