Initial import.

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diff --git a/chromium/base/message_loop/message_loop_proxy.h b/chromium/base/message_loop/message_loop_proxy.h
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+// Copyright (c) 2012 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 BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_
+#define BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_
+
+#include "base/base_export.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
+
+namespace base {
+
+// This class provides a thread-safe refcounted interface to the Post* methods
+// of a message loop. This class can outlive the target message loop.
+// MessageLoopProxy objects are constructed automatically for all MessageLoops.
+// So, to access them, you can use any of the following:
+//   Thread::message_loop_proxy()
+//   MessageLoop::current()->message_loop_proxy()
+//   MessageLoopProxy::current()
+//
+// TODO(akalin): Now that we have the *TaskRunner interfaces, we can
+// merge this with MessageLoopProxyImpl.
+class BASE_EXPORT MessageLoopProxy : public SingleThreadTaskRunner {
+ public:
+  // Gets the MessageLoopProxy for the current message loop, creating one if
+  // needed.
+  static scoped_refptr<MessageLoopProxy> current();
+
+ protected:
+  MessageLoopProxy();
+  virtual ~MessageLoopProxy();
+};
+
+}  // namespace base
+
+#endif  // BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_