Support UseCounter in dedicated workers.

Source/core/workers/WorkerObjectProxy.cpp

Index: Source/core/workers/WorkerObjectProxy.cpp
diff --git a/Source/core/workers/WorkerObjectProxy.cpp b/Source/core/workers/WorkerObjectProxy.cpp
index 198f36fbe1155f1f10d41d5c541a211f1142ea12..8acf0350fcc13c5f32b969bc375e217c0c5cc99d 100644
--- a/Source/core/workers/WorkerObjectProxy.cpp
+++ b/Source/core/workers/WorkerObjectProxy.cpp
@@ -49,6 +49,11 @@ void WorkerObjectProxy::postMessageToWorkerObject(PassRefPtr<SerializedScriptVal
     m_executionContext->postTask(bind(&WorkerMessagingProxy::postMessageToWorkerObject, m_messagingProxy, message, channels));
 }
 
+void WorkerObjectProxy::postTaskToMainExecutionContext(PassOwnPtr<ExecutionContextTask> task)
+{
+    m_executionContext->postTask(task);
+}
+
 void WorkerObjectProxy::confirmMessageFromWorkerObject(bool hasPendingActivity)
 {
     m_executionContext->postTask(bind(&WorkerMessagingProxy::confirmMessageFromWorkerObject, m_messagingProxy, hasPendingActivity));