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

remoting/host/process_stats_util.h

Index: remoting/host/process_stats_util.h
diff --git a/remoting/host/process_stats_util.h b/remoting/host/process_stats_util.h
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+++ b/remoting/host/process_stats_util.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_PROCESS_STATS_UTIL_H_
+#define REMOTING_HOST_PROCESS_STATS_UTIL_H_
+
+#include <vector>
+
+#include "remoting/proto/process_stats.pb.h"
+
+namespace remoting {
+
+// Whether the |usage| is empty, i.e. all fields hold initial values.
+bool IsEmptyProcessResourceUsage(const protocol::ProcessResourceUsage& usage);
+
+// Merges several ProcessResourceUsage instances into one
+// AggregatedProcessResourceUsage.
+protocol::AggregatedProcessResourceUsage AggregateProcessResourceUsage(
+    const std::vector<protocol::ProcessResourceUsage>& usages);
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_PROCESS_STATS_UTIL_H_