Support UseCounter in dedicated workers.

Source/core/workers/DedicatedWorkerGlobalScope.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 60 matching lines @@
         return;
     thread()->workerObjectProxy().postMessageToWorkerObject(message, channels.release());
 }
 
 void DedicatedWorkerGlobalScope::importScripts(const Vector<String>& urls, ExceptionState& exceptionState)
 {
     Base::importScripts(urls, exceptionState);
     thread()->workerObjectProxy().reportPendingActivity(hasPendingActivity());
 }
 
-DedicatedWorkerThread* DedicatedWorkerGlobalScope::thread()
+DedicatedWorkerThread* DedicatedWorkerGlobalScope::thread() const
 {
     return static_cast<DedicatedWorkerThread*>(Base::thread());
 }
 
+class UseCounterTask : public ExecutionContextTask {
+public:
+    static PassOwnPtr<UseCounterTask> create(UseCounter::Feature feature) { return adoptPtr(new UseCounterTask(feature)); }
+
+private:
+    explicit UseCounterTask(UseCounter::Feature feature) : m_feature(feature) { }
+    virtual void performTask(ExecutionContext* context) OVERRIDE
+    {
+        UseCounter::count(*toDocument(context), m_feature);
+    }
+
+    UseCounter::Feature m_feature;
+};
+
+void DedicatedWorkerGlobalScope::countFeature(UseCounter::Feature feature) const
+{
+    thread()->workerObjectProxy().postTaskToMainExecutionContext(UseCounterTask::create(feature));
+}
+
 void DedicatedWorkerGlobalScope::trace(Visitor* visitor)
 {
     WorkerGlobalScope::trace(visitor);
 }
 
 } // namespace WebCore