Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl

Index: third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
diff --git a/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl b/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
index 2c6f355a2bf682f5cdb7cacef25468cbbbec0c08..70b5537c6a940ab913b78c7220d5207748adb02c 100644
--- a/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
+++ b/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
@@ -57,12 +57,12 @@
     [RuntimeEnabled=CorsRFC1918, ImplementedAs=addressSpaceForBindings] readonly attribute AddressSpace addressSpace;
 
     // Unhandled Promise Rejection Events
-    attribute EventHandler onrejectionhandled;
-    attribute EventHandler onunhandledrejection;
+    [Measure] attribute EventHandler onrejectionhandled;
+    [Measure] attribute EventHandler onunhandledrejection;
 
     // Secure Contexts
     // https://w3c.github.io/webappsec-secure-contexts/#dom-windoworworkerglobalscope-issecurecontext
-    [ImplementedAs=isSecureContextForBindings] readonly attribute boolean isSecureContext;
+  [Measure, ImplementedAs=isSecureContextForBindings] readonly attribute boolean isSecureContext;
 };
 
 WorkerGlobalScope implements WindowBase64;