Expose performance.memory in workers

Source/core/workers/WorkerGlobalScope.h

Index: Source/core/workers/WorkerGlobalScope.h
diff --git a/Source/core/workers/WorkerGlobalScope.h b/Source/core/workers/WorkerGlobalScope.h
index 8bbc43e3c645db3b87f577eda5e21ac283e24f13..6d6b5ac152f6cbab96d98e8966ec865488f9c2ff 100644
--- a/Source/core/workers/WorkerGlobalScope.h
+++ b/Source/core/workers/WorkerGlobalScope.h
@@ -135,13 +135,15 @@ namespace WebCore {
 
         double timeOrigin() const { return m_timeOrigin; }
 
+        bool memoryInfoEnabled() const { return m_memoryInfoEnabled; };
+
         WorkerClients* clients() { return m_workerClients.get(); }
 
         using SecurityContext::securityOrigin;
         using SecurityContext::contentSecurityPolicy;
 
     protected:
-        WorkerGlobalScope(const KURL&, const String& userAgent, WorkerThread*, double timeOrigin, PassOwnPtr<WorkerClients>);
+        WorkerGlobalScope(const KURL&, const String& userAgent, WorkerThread*, double timeOrigin, bool memoryInfoEnabled, PassOwnPtr<WorkerClients>);
         void applyContentSecurityPolicyFromString(const String& contentSecurityPolicy, ContentSecurityPolicy::HeaderType);
 
         virtual void logExceptionToConsole(const String& errorMessage, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtr<ScriptCallStack>) OVERRIDE;
@@ -181,6 +183,7 @@ namespace WebCore {
         OwnPtr<WorkerClients> m_workerClients;
 
         double m_timeOrigin;
+        bool m_memoryInfoEnabled;
     };
 
 DEFINE_TYPE_CASTS(WorkerGlobalScope, ExecutionContext, context, context->isWorkerGlobalScope(), context.isWorkerGlobalScope());