Expose performance.memory 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 425700aee6e39a6d218e3f5e5735e9339b91beee..d8edeb835501dac793b9c3d0968320dc75bd755c 100644
--- a/Source/core/workers/WorkerMessagingProxy.cpp
+++ b/Source/core/workers/WorkerMessagingProxy.cpp
@@ -35,6 +35,7 @@
 #include "core/events/MessageEvent.h"
 #include "core/frame/ContentSecurityPolicy.h"
 #include "core/frame/DOMWindow.h"
+#include "core/frame/Settings.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/ScriptCallStack.h"
 #include "core/inspector/WorkerDebuggerAgent.h"
@@ -114,7 +115,10 @@ void WorkerMessagingProxy::startWorkerGlobalScope(const KURL& scriptURL, const S
     OwnPtr<WorkerThreadStartupData> startupData = WorkerThreadStartupData::create(scriptURL, userAgent, sourceCode, startMode, document->contentSecurityPolicy()->deprecatedHeader(), document->contentSecurityPolicy()->deprecatedHeaderType(), m_workerClients.release());
     double originTime = document->loader() ? document->loader()->timing()->referenceMonotonicTime() : monotonicallyIncreasingTime();
 
-    RefPtr<DedicatedWorkerThread> thread = DedicatedWorkerThread::create(*this, *m_workerObjectProxy.get(), originTime, startupData.release());
+    OwnPtr<WorkerSettings> settings = WorkerSettings::create();
+    if (document->settings())
+        settings->setMemoryInfoEnabled(document->settings()->memoryInfoEnabled());
+    RefPtr<DedicatedWorkerThread> thread = DedicatedWorkerThread::create(*this, *m_workerObjectProxy.get(), originTime, settings.release(), startupData.release());
     workerThreadCreated(thread);
     thread->start();
     InspectorInstrumentation::didStartWorkerGlobalScope(m_executionContext.get(), this, scriptURL);