Add use counters for lots of DOM APIs.

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

Index: third_party/WebKit/Source/core/animation/ElementAnimation.idl
diff --git a/third_party/WebKit/Source/core/animation/ElementAnimation.idl b/third_party/WebKit/Source/core/animation/ElementAnimation.idl
index 3c5e42ba3ab95cc070a8312c4ffcd95f8eec5971..779f0a0a89c9280a6b0b8b998b636f915faa2749 100644
--- a/third_party/WebKit/Source/core/animation/ElementAnimation.idl
+++ b/third_party/WebKit/Source/core/animation/ElementAnimation.idl
@@ -40,5 +40,5 @@ partial interface Element {
     // 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();
 };