Add some empty classes for the embedded SharedWorker.

content/browser/worker_host/shared_worker_host.h

+// 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.
+
+#ifndef CONTENT_BROWSER_WORKER_HOST_SHARED_WORKER_HOST_H_
+#define CONTENT_BROWSER_WORKER_HOST_SHARED_WORKER_HOST_H_
+
+#include "base/memory/scoped_ptr.h"
+
+#include "content/browser/worker_host/shared_worker_instance.h"
+
+namespace content {
+
+// If "enable-embedded-shared-worker" is set this class will be used in stead of
+// WorkerProcessHost.
+// TODO(horo): implement this class.
+class SharedWorkerHost {
+ public:
+  SharedWorkerHost(SharedWorkerInstance* instance);
+  virtual ~SharedWorkerHost();
+
+ private:
+  scoped_ptr<SharedWorkerInstance> instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(SharedWorkerHost);
+};
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_WORKER_HOST_SHARED_WORKER_HOST_H_