Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/animation/ElementAnimation.idl

 /*
  * Copyright (C) 2013 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 22 matching lines @@
 
 // TODO(dstockwell): This should be an Animatable interface, where Element
 // implements Animatable. The interface also has several changes:
 // https://w3c.github.io/web-animations/#the-animatable-interface
 
 partial interface Element {
     // FIXME: Union types with dictionary type members doesn't work (yet).
     // Animation animate((sequence<Dictionary> or Dictionary)? effect, optional (double or KeyframeEffectOptions) timing);
     [CallWith=ExecutionContext, Measure, RaisesException] Animation animate((sequence<Dictionary> or Dictionary)? effect, optional double timing);
     [CallWith=ExecutionContext, Measure, RaisesException] Animation animate((sequence<Dictionary> or Dictionary)? effect, KeyframeEffectOptions timing);
-    [RuntimeEnabled=WebAnimationsAPI] sequence<Animation> getAnimations();
+  [RuntimeEnabled=WebAnimationsAPI, Measure] sequence<Animation> getAnimations();
 };