Support UseCounter in dedicated workers.

Source/core/workers/WorkerGlobalScope.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 304 matching lines @@
 bool WorkerGlobalScope::idleNotification()
 {
     return script()->idleNotification();
 }
 
 WorkerEventQueue* WorkerGlobalScope::eventQueue() const
 {
     return m_eventQueue.get();
 }
 
+void WorkerGlobalScope::countFeature(UseCounter::Feature) const
+{
+    // FIXME: How should we count features for shared/service workers?
+}
+
 void WorkerGlobalScope::trace(Visitor* visitor)
 {
     visitor->trace(m_console);
     visitor->trace(m_location);
     visitor->trace(m_navigator);
     visitor->trace(m_eventQueue);
     visitor->trace(m_workerClients);
     WillBeHeapSupplementable<WorkerGlobalScope>::trace(visitor);
     ExecutionContext::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore