Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/clipboard/DataTransfer.idl

 /*
  * Copyright (C) 2008 Apple 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
@@ skipping 11 matching lines @@
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR 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.
  */
 
 // https://html.spec.whatwg.org/#the-datatransfer-interface
 
 interface DataTransfer {
-    attribute DOMString dropEffect;
-    attribute DOMString effectAllowed;
+    [Measure] attribute DOMString dropEffect;
+    [Measure] attribute DOMString effectAllowed;
 
-    [SameObject] readonly attribute DataTransferItemList items;
+    [SameObject, Measure] readonly attribute DataTransferItemList items;
 
-    void setDragImage(Element image, long x, long y);
+    [Measure] void setDragImage(Element image, long x, long y);
 
     /* old interface */
     // TODO(foolip): Switch to FrozenArray<DOMString> when the spec is fixed:
     // https://github.com/whatwg/html/issues/11
-    [SameObject] readonly attribute DOMString[] types;
-    DOMString getData(DOMString format);
-    void setData(DOMString format, DOMString data);
-    void clearData(optional DOMString format);
-    [SameObject] readonly attribute FileList files;
+    [SameObject, Measure] readonly attribute DOMString[] types;
+    [Measure] DOMString getData(DOMString format);
+    [Measure] void setData(DOMString format, DOMString data);
+    [Measure] void clearData(optional DOMString format);
+    [SameObject, Measure] readonly attribute FileList files;
 };