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diff --git a/remoting/host/setup/native_messaging_writer.h b/remoting/host/setup/native_messaging_writer.h
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+++ b/remoting/host/setup/native_messaging_writer.h
@@ -0,0 +1,37 @@
+// Copyright 2013 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 REMOTING_HOST_SETUP_NATIVE_MESSAGING_WRITER_H_
+#define REMOTING_HOST_SETUP_NATIVE_MESSAGING_WRITER_H_
+
+#include "base/platform_file.h"
+#include "net/base/file_stream.h"
+
+namespace base {
+class Value;
+}  // namespace base
+
+namespace remoting {
+
+// This class is used for sending messages to the Native Messaging client
+// webapp.
+class NativeMessagingWriter {
+ public:
+  explicit NativeMessagingWriter(base::PlatformFile handle);
+  ~NativeMessagingWriter();
+
+  // Sends a message to the Native Messaging client, returning true if
+  // successful.
+  bool WriteMessage(const base::Value& message);
+
+ private:
+  net::FileStream write_stream_;
+  bool fail_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeMessagingWriter);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_SETUP_NATIVE_MESSAGING_WRITER_H_