Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/events/InputEvent.idl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://w3c.github.io/uievents/#interface-inputevent
 
 // Input Events
 // https://w3c.github.io/input-events/#interface-InputEvent
 [
     Constructor(DOMString type, optional InputEventInit eventInitDict),
     RuntimeEnabled=InputEvent,
 ] interface InputEvent : UIEvent {
-    readonly attribute DOMString inputType;
-    readonly attribute DOMString? data;
-    readonly attribute DataTransfer? dataTransfer;
-    readonly attribute boolean isComposing;
-    sequence<StaticRange> getTargetRanges();
+    [Measure] readonly attribute DOMString inputType;
+    [Measure] readonly attribute DOMString? data;
+    [Measure] readonly attribute DataTransfer? dataTransfer;
+    [Measure] readonly attribute boolean isComposing;
+    [Measure] sequence<StaticRange> getTargetRanges();
 };