Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/css/CSSKeyframesRule.idl

 /*
  * Copyright (C) 2008 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * (INCLUDING, BUT NOT 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://dev.w3.org/csswg/css-animations/#interface-csskeyframesrule
 
 interface CSSKeyframesRule : CSSRule {
-    attribute DOMString name;
-    readonly attribute CSSRuleList cssRules;
+    [Measure] attribute DOMString name;
+    [Measure] readonly attribute CSSRuleList cssRules;
 
-    void appendRule(DOMString rule);
-    void deleteRule(DOMString select);
-    CSSKeyframeRule? findRule(DOMString select);
+    [Measure] void appendRule(DOMString rule);
+    [Measure] void deleteRule(DOMString select);
+    [Measure] CSSKeyframeRule? findRule(DOMString select);
 
     // Non-standard APIs
     [NotEnumerable] getter CSSKeyframeRule (unsigned long index);
 };