Expose performance.memory in workers

Source/core/workers/WorkerSettings.cpp

Index: Source/core/workers/WorkerSettings.cpp
diff --git a/Source/core/workers/WorkerSettings.cpp b/Source/core/workers/WorkerSettings.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f83869d40eb9f50c7fac4133cecc469596e9ffb7
--- /dev/null
+++ b/Source/core/workers/WorkerSettings.cpp
@@ -0,0 +1,21 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/workers/WorkerSettings.h"
+
+#include "core/frame/Settings.h"
+
+namespace WebCore {
+
+WorkerSettings::WorkerSettings(Settings* settings)
+    : m_memoryInfoEnabled(false)
+{
+    if (!settings)
+        return;
+
+    m_memoryInfoEnabled = settings->memoryInfoEnabled();
+}
+
+} // namespace WebCore