Add use counters for lots of DOM APIs.

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

Index: third_party/WebKit/Source/core/html/ValidityState.idl
diff --git a/third_party/WebKit/Source/core/html/ValidityState.idl b/third_party/WebKit/Source/core/html/ValidityState.idl
index 117bb925acb9ca170eb27e327787456eaa729aa3..f92708fc7d68d8f3eb387955906f6c70df9b1aaa 100644
--- a/third_party/WebKit/Source/core/html/ValidityState.idl
+++ b/third_party/WebKit/Source/core/html/ValidityState.idl
@@ -23,15 +23,15 @@
 // https://html.spec.whatwg.org/#validitystate
 
 interface ValidityState {
-    readonly attribute boolean valueMissing;
-    readonly attribute boolean typeMismatch;
-    readonly attribute boolean patternMismatch;
-    readonly attribute boolean tooLong;
-    readonly attribute boolean tooShort;
-    readonly attribute boolean rangeUnderflow;
-    readonly attribute boolean rangeOverflow;
-    readonly attribute boolean stepMismatch;
-    readonly attribute boolean badInput;
-    readonly attribute boolean customError;
-    readonly attribute boolean valid;
+    [MeasureAs=ValidationAPI] readonly attribute boolean valueMissing;
+    [MeasureAs=ValidationAPI] readonly attribute boolean typeMismatch;
+    [MeasureAs=ValidationAPI] readonly attribute boolean patternMismatch;
+    [MeasureAs=ValidationAPI] readonly attribute boolean tooLong;
+    [MeasureAs=ValidationAPI] readonly attribute boolean tooShort;
+    [MeasureAs=ValidationAPI] readonly attribute boolean rangeUnderflow;
+    [MeasureAs=ValidationAPI] readonly attribute boolean rangeOverflow;
+    [MeasureAs=ValidationAPI] readonly attribute boolean stepMismatch;
+    [MeasureAs=ValidationAPI] readonly attribute boolean badInput;
+    [MeasureAs=ValidationAPI] readonly attribute boolean customError;
+    [MeasureAs=ValidationAPI] readonly attribute boolean valid;
 };