[Chromoting] Implement HostExperimentSessionPlugin

remoting/host/host_experiment_session_plugin.h

+// 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_HOST_HOST_EXPERIMENT_SESSION_PLUGIN_H_
+#define REMOTING_HOST_HOST_EXPERIMENT_SESSION_PLUGIN_H_
+
+#include <memory>
+#include <string>
+
+#include "remoting/protocol/session_plugin.h"
+#include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
+
+namespace remoting {
+
+// A SessionPlugin implementation to send host attributes to client, and
+// receives experiment settings. This plugin is for host only.

[Sergey Ulanov, 2017/01/05 20:45:06]

Don't need the last sentence. It's implied by location of this file and also
class name.

[Hzj_jie, 2017/01/05 23:37:27]

Done.

+class HostExperimentSessionPlugin : public protocol::SessionPlugin {
+ public:
+  using SessionPlugin::SessionPlugin;
+
+  std::unique_ptr<buzz::XmlElement> GetNextMessage() override;

[Sergey Ulanov, 2017/01/05 20:45:06]

// protocol::SessionPlugin implementation.

[Hzj_jie, 2017/01/05 23:37:27]

Done.

+
+  void OnIncomingMessage(const buzz::XmlElement& attachments) override;
+
+  // The configuration sent from client, may be empty.
+  const std::string& configuration() const;
+
+ private:
+  bool attributes_sent_ = false;
+  std::string configuration_;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_HOST_EXPERIMENT_SESSION_PLUGIN_H_