[Chromoting] Retrieve process resource usage (ProcessStats) and its tests

remoting/base/forward_process_stats_agent.h

+// Copyright 2017 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_BASE_FORWARD_PROCESS_STATS_AGENT_H_
+#define REMOTING_BASE_FORWARD_PROCESS_STATS_AGENT_H_
+
+#include "base/synchronization/lock.h"
+#include "remoting/base/process_stats_agent.h"
+#include "remoting/base/process_stats_stub.h"
+#include "remoting/proto/process_stats.pb.h"
+
+namespace remoting {
+
+// A component to forward statistic data of another process.
+class ForwardProcessStatsAgent final : public ProcessStatsAgent {
+ public:
+  ForwardProcessStatsAgent();
+  ~ForwardProcessStatsAgent() override;
+
+  protocol::ProcessResourceUsage GetResourceUsage() override;
+
+  void OnProcessStats(const protocol::ProcessResourceUsage& usage);
+
+ private:
+  base::Lock lock_;
+  protocol::ProcessResourceUsage usage_;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_BASE_FORWARD_PROCESS_STATS_AGENT_H_