Add use counters for lots of DOM APIs.

third_party/WebKit/Source/modules/crypto/CryptoKey.idl

Index: third_party/WebKit/Source/modules/crypto/CryptoKey.idl
diff --git a/third_party/WebKit/Source/modules/crypto/CryptoKey.idl b/third_party/WebKit/Source/modules/crypto/CryptoKey.idl
index bce2c9110d96f4bd23999e1a33c838cfe7de1eaf..1039cfc47bc0dd3420ace98d9585a8c1595b1730 100644
--- a/third_party/WebKit/Source/modules/crypto/CryptoKey.idl
+++ b/third_party/WebKit/Source/modules/crypto/CryptoKey.idl
@@ -33,9 +33,9 @@
 [
     Exposed=(Window,Worker)
 ] interface CryptoKey {
-    readonly attribute DOMString type;
-    readonly attribute boolean extractable;
-    [CallWith=ScriptState] readonly attribute object algorithm;
+    [Measure] readonly attribute DOMString type;
+    [Measure] readonly attribute boolean extractable;
+  [Measure, CallWith=ScriptState] readonly attribute object algorithm;
     // TODO(jyasskin): |usages| should be of type object.
-    readonly attribute DOMString[] usages;
+    [Measure] readonly attribute DOMString[] usages;
 };