Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/html/HTMLTrackElement.idl

Index: third_party/WebKit/Source/core/html/HTMLTrackElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLTrackElement.idl b/third_party/WebKit/Source/core/html/HTMLTrackElement.idl
index b3334c25812be2dec34adf5b5c2d7a8b4320163d..14abeff0fd0e42731a6558a6da5924cdb6b50ca8 100644
--- a/third_party/WebKit/Source/core/html/HTMLTrackElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLTrackElement.idl
@@ -26,17 +26,17 @@
 // https://html.spec.whatwg.org/#the-track-element
 
 interface HTMLTrackElement : HTMLElement {
-    [CEReactions] attribute DOMString kind;
-    [CEReactions, Reflect, URL] attribute DOMString src;
-    [CEReactions, Reflect] attribute DOMString srclang;
-    [CEReactions, Reflect] attribute DOMString label;
-    [CEReactions, Reflect] attribute boolean default;
+  [Measure, CEReactions] attribute DOMString kind;
+  [Measure, CEReactions, Reflect, URL] attribute DOMString src;
+  [Measure, CEReactions, Reflect] attribute DOMString srclang;
+  [Measure, CEReactions, Reflect] attribute DOMString label;
+  [Measure, CEReactions, Reflect] attribute boolean default;
 
     const unsigned short NONE = 0;
     const unsigned short LOADING = 1;
     const unsigned short LOADED = 2;
     const unsigned short ERROR = 3;
-    [ImplementedAs=getReadyState] readonly attribute unsigned short readyState;
+  [Measure, ImplementedAs=getReadyState] readonly attribute unsigned short readyState;
 
-    readonly attribute TextTrack track;
+  [Measure] readonly attribute TextTrack track;
 };