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

remoting/host/current_process_stats_agent.h

Index: remoting/host/current_process_stats_agent.h
diff --git a/remoting/host/current_process_stats_agent.h b/remoting/host/current_process_stats_agent.h
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+// 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_HOST_CURRENT_PROCESS_STATS_AGENT_H_
+#define REMOTING_HOST_CURRENT_PROCESS_STATS_AGENT_H_
+
+#include <memory>
+#include <string>
+
+#include "remoting/host/process_stats_agent.h"
+#include "remoting/proto/process_stats.pb.h"
+
+namespace base {
+class ProcessMetrics;
+}  // namespace base
+
+namespace remoting {
+
+// A component to report statistic data of the current process.
+class CurrentProcessStatsAgent final : public ProcessStatsAgent {
+ public:
+  explicit CurrentProcessStatsAgent(const std::string& process_name);
+  ~CurrentProcessStatsAgent() override;
+
+  // ProcessStatsAgent implementation.
+  protocol::ProcessResourceUsage GetResourceUsage() override;
+
+ private:
+  const std::string process_name_;
+  const std::unique_ptr<base::ProcessMetrics> metrics_;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_CURRENT_PROCESS_STATS_AGENT_H_