Support UseCounter in dedicated workers.

Source/core/workers/WorkerGlobalScope.h

Index: Source/core/workers/WorkerGlobalScope.h
diff --git a/Source/core/workers/WorkerGlobalScope.h b/Source/core/workers/WorkerGlobalScope.h
index ef047459ff0512d25f920966fafbfa52e0d51992..ee1283eca8c273f605836d66dca797c2d73ba5c1 100644
--- a/Source/core/workers/WorkerGlobalScope.h
+++ b/Source/core/workers/WorkerGlobalScope.h
@@ -33,6 +33,7 @@
 #include "core/events/EventListener.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowBase64.h"
+#include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/workers/WorkerEventQueue.h"
 #include "platform/heap/Handle.h"
@@ -70,6 +71,7 @@ namespace WebCore {
         virtual bool isSharedWorkerGlobalScope() const { return false; }
         virtual bool isDedicatedWorkerGlobalScope() const { return false; }
         virtual bool isServiceWorkerGlobalScope() const { return false; }
+        virtual void countFeature(UseCounter::Feature) const;
 
         const KURL& url() const { return m_url; }
         KURL completeURL(const String&) const;