Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/clipboard/DataTransferItem.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * 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-datatransferitem-interface
 
 interface DataTransferItem {
-    readonly attribute DOMString kind;
-    readonly attribute DOMString type;
+    [Measure] readonly attribute DOMString kind;
+    [Measure] readonly attribute DOMString type;
     // TODO(foolip): The callback argument should be a FunctionStringCallback.
-    [CallWith=ExecutionContext] void getAsString(StringCallback? callback);
+    [CallWith=ExecutionContext, Measure] void getAsString(StringCallback? callback);
     // TODO(foolip): getAsFile() should return a File object. crbug.com/361145
-    Blob? getAsFile();
+    [Measure] Blob? getAsFile();
 };