Add policy to restrict client domain for Me2Me.

remoting/protocol/rejecting_authenticator.h

Index: remoting/protocol/rejecting_authenticator.h
diff --git a/remoting/protocol/rejecting_authenticator.h b/remoting/protocol/rejecting_authenticator.h
new file mode 100644
index 0000000000000000000000000000000000000000..cced70dbc6fd129667fc9a4d22cf5d1a0d0e9e47
--- /dev/null
+++ b/remoting/protocol/rejecting_authenticator.h
@@ -0,0 +1,42 @@
+// Copyright 2016 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_PROTOCOL_REJECTING_AUTHENTICATOR_FACTORY_H_
+#define REMOTING_PROTOCOL_REJECTING_AUTHENTICATOR_FACTORY_H_
+
+#include <string>
+
+#include "remoting/protocol/authenticator.h"
+
+namespace remoting {
+namespace protocol {
+
+// Authenticator that accepts one message and rejects connection after that.
+class RejectingAuthenticator : public Authenticator {
+ public:
+  RejectingAuthenticator(RejectionReason rejection_reason);
+  ~RejectingAuthenticator() override;
+
+  // Authenticator interface
+  State state() const override;
+  bool started() const override;
+  RejectionReason rejection_reason() const override;
+  void ProcessMessage(const buzz::XmlElement* message,
+                      const base::Closure& resume_callback) override;
+  scoped_ptr<buzz::XmlElement> GetNextMessage() override;
+  const std::string& GetAuthKey() const override;
+  scoped_ptr<ChannelAuthenticator> CreateChannelAuthenticator() const override;
+
+ private:
+  RejectionReason rejection_reason_;
+  State state_ = WAITING_MESSAGE;
+  std::string auth_key_;
+
+  DISALLOW_COPY_AND_ASSIGN(RejectingAuthenticator);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_REJECTING_AUTHENTICATOR_FACTORY_H_