Support performance.now() in workers.

Source/core/workers/WorkerMessagingProxy.cpp

Index: Source/core/workers/WorkerMessagingProxy.cpp
diff --git a/Source/core/workers/WorkerMessagingProxy.cpp b/Source/core/workers/WorkerMessagingProxy.cpp
index e54726ab61bfd53f00343dc6096374f7ca86095c..fe17c5c7fd79541256cb0242ecf3b8ef4831025c 100644
--- a/Source/core/workers/WorkerMessagingProxy.cpp
+++ b/Source/core/workers/WorkerMessagingProxy.cpp
@@ -39,6 +39,8 @@
 #include "core/inspector/ScriptCallStack.h"
 #include "core/inspector/WorkerDebuggerAgent.h"
 #include "core/inspector/WorkerInspectorController.h"
+#include "core/loader/DocumentLoadTiming.h"
+#include "core/loader/DocumentLoader.h"
 #include "core/page/ContentSecurityPolicy.h"
 #include "core/page/DOMWindow.h"
 #include "core/page/PageGroup.h"
@@ -265,7 +267,7 @@ void WorkerMessagingProxy::startWorkerContext(const KURL& scriptURL, const Strin
     GroupSettings* settings = 0;
     if (document->page())
         settings = document->page()->group().groupSettings();
-    RefPtr<DedicatedWorkerThread> thread = DedicatedWorkerThread::create(scriptURL, userAgent, settings, sourceCode, *this, *this, startMode, document->contentSecurityPolicy()->deprecatedHeader(), document->contentSecurityPolicy()->deprecatedHeaderType(), document->topOrigin());
+    RefPtr<DedicatedWorkerThread> thread = DedicatedWorkerThread::create(scriptURL, userAgent, settings, sourceCode, *this, *this, startMode, document->contentSecurityPolicy()->deprecatedHeader(), document->contentSecurityPolicy()->deprecatedHeaderType(), document->topOrigin(), document->loader()->timing()->referenceMonotonicTime());
     workerThreadCreated(thread);
     thread->start();
     InspectorInstrumentation::didStartWorkerContext(m_scriptExecutionContext.get(), this, scriptURL);