Add use counters for lots of DOM APIs.

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

Index: third_party/WebKit/Source/core/css/CSSKeyframesRule.idl
diff --git a/third_party/WebKit/Source/core/css/CSSKeyframesRule.idl b/third_party/WebKit/Source/core/css/CSSKeyframesRule.idl
index 0e88b1f1453f06974e3dd10d5a3dfe4a9a90762c..a90b1e74a1d8dd0e51b9dbae17482603e2ac378a 100644
--- a/third_party/WebKit/Source/core/css/CSSKeyframesRule.idl
+++ b/third_party/WebKit/Source/core/css/CSSKeyframesRule.idl
@@ -29,12 +29,12 @@
 // 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);