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

remoting/base/process_resource_usage.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_PROCESS_RESOURCE_USAGE_H_
+#define REMOTING_BASE_PROCESS_RESOURCE_USAGE_H_
+
+#include <stddef.h>
+
+namespace remoting {
+
+// A collection of the resource usage of a process.
+struct ProcessResourceUsage {
+  // Processor usage. It should be a consistent value on all platforms in
+  // range of 0 to (100 * NumCPUCores).
+  double processor_usage = 0;
+
+  // Memory usage of working set.
+  size_t working_set_size = 0;

[Sergey Ulanov, 2017/03/27 19:43:20]

Is it in bytes?

[Hzj_jie, 2017/03/30 01:09:45]

Yes.

+
+  // Memory usage of page file.
+  size_t pagefile_size = 0;
+
+  // Merges the usage from |other| to |this|.
+  void Append(const ProcessResourceUsage& other);

[Sergey Ulanov, 2017/03/27 19:43:19]

Call it Add(), since the order is irrelevant.

[Hzj_jie, 2017/03/30 01:09:45]

Done.

+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_BASE_PROCESS_RESOURCE_USAGE_H_