Expose performance.memory in workers

Source/modules/performance/WorkerPerformance.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/performance/WorkerPerformance.h"
 
+#include "core/timing/MemoryInfo.h"
 #include "core/workers/DedicatedWorkerGlobalScope.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
 
 WorkerPerformance::WorkerPerformance()
 {
     ScriptWrappable::init(this);
 }
 
 WorkerPerformance::~WorkerPerformance()
 {
 }
 
 double WorkerPerformance::now(ExecutionContext* context) const
 {
     ASSERT(context);
     ASSERT(context->isWorkerGlobalScope());
     WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
     return 1000.0 * (monotonicallyIncreasingTime() - workerGlobalScope->timeOrigin());
 }
 
+PassRefPtrWillBeRawPtr<MemoryInfo> WorkerPerformance::memory() const
+{
+    // FIXME: We shall not create a new object every time.
+    return MemoryInfo::create();
+}
+
 } // namespace WebCore