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

remoting/base/process_resource_usage.cc

+// 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.
+
+#include "remoting/base/process_resource_usage.h"
+
+namespace remoting {
+
+void ProcessResourceUsage::Append(const ProcessResourceUsage& other) {
+  processor_usage += other.processor_usage;

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

I think it would be useful to collect info for each process individually and it
shouldn't be hard to implement here.

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

Done.

+  working_set_size += other.working_set_size;
+  pagefile_size += other.pagefile_size;
+}
+
+}  // namespace remoting