Add use counters for lots of DOM APIs.

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

Index: third_party/WebKit/Source/core/html/HTMLOutputElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLOutputElement.idl b/third_party/WebKit/Source/core/html/HTMLOutputElement.idl
index 8e55d6cf2a4ef21c80f200bd090305315a08300c..227a9b13ae2a9bfbb9fad9ce3c3babb903edfb47 100644
--- a/third_party/WebKit/Source/core/html/HTMLOutputElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLOutputElement.idl
@@ -26,20 +26,20 @@
 // https://html.spec.whatwg.org/#the-output-element
 
 interface HTMLOutputElement : HTMLElement {
-    [CEReactions, PutForwards=value] readonly attribute DOMTokenList htmlFor;
-    [ImplementedAs=formOwner] readonly attribute HTMLFormElement? form;
-    [CEReactions, Reflect] attribute DOMString name;
+  [Measure, CEReactions, PutForwards=value] readonly attribute DOMTokenList htmlFor;
+  [Measure, ImplementedAs=formOwner] readonly attribute HTMLFormElement? form;
+  [Measure, CEReactions, Reflect] attribute DOMString name;
 
-    readonly attribute DOMString type;
-    [CEReactions] attribute DOMString defaultValue;
-    [CEReactions] attribute DOMString value;
+    [Measure] readonly attribute DOMString type;
+  [Measure, CEReactions] attribute DOMString defaultValue;
+  [Measure, CEReactions] attribute DOMString value;
 
-    readonly attribute boolean willValidate;
-    readonly attribute ValidityState validity;
-    readonly attribute DOMString validationMessage;
-    boolean checkValidity();
-    boolean reportValidity();
-    void setCustomValidity(DOMString error);
+    [MeasureAs=ValidationAPI] readonly attribute boolean willValidate;
+    [MeasureAs=ValidationAPI] readonly attribute ValidityState validity;
+    [MeasureAs=ValidationAPI] readonly attribute DOMString validationMessage;
+    [MeasureAs=ValidationAPI] boolean checkValidity();
+    [MeasureAs=ValidationAPI] boolean reportValidity();
+    [MeasureAs=ValidationAPI] void setCustomValidity(DOMString error);
 
     readonly attribute NodeList labels;
 };