Add use counters for lots of DOM APIs.

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

Index: third_party/WebKit/Source/core/html/HTMLButtonElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLButtonElement.idl b/third_party/WebKit/Source/core/html/HTMLButtonElement.idl
index b357e682e28654c59ff25636a3f3aedd7359b02f..2d4d248191e93f1e9c469f632d3904a0a656b2a4 100644
--- a/third_party/WebKit/Source/core/html/HTMLButtonElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLButtonElement.idl
@@ -21,7 +21,7 @@
 // https://html.spec.whatwg.org/#the-button-element
 
 interface HTMLButtonElement : HTMLElement {
-    [CEReactions, Reflect] attribute boolean autofocus;
+  [Measure, CEReactions, Reflect] attribute boolean autofocus;
     [CEReactions, Reflect] attribute boolean disabled;
     [ImplementedAs=formOwner] readonly attribute HTMLFormElement? form;
     [CEReactions] attribute DOMString formAction;
@@ -34,12 +34,12 @@ interface HTMLButtonElement : HTMLElement {
     [CEReactions, Reflect] attribute DOMString value;
     // FIXME: attribute HTMLMenuElement? menu;
 
-    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;
 };