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

remoting/base/process_stats_agent.h

Index: remoting/base/process_stats_agent.h
diff --git a/remoting/base/process_stats_agent.h b/remoting/base/process_stats_agent.h
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+++ b/remoting/base/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_BASE_PROCESS_STATS_AGENT_H_
+#define REMOTING_BASE_PROCESS_STATS_AGENT_H_
+
+#include "remoting/proto/process_stats.pb.h"
+
+namespace remoting {
+
+// An interface to report the process statistic data.
+class ProcessStatsAgent {
+ public:
+  ProcessStatsAgent();
+  virtual ~ProcessStatsAgent();
+
+  virtual protocol::ProcessResourceUsage GetResourceUsage() = 0;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_BASE_PROCESS_STATS_AGENT_H_