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

remoting/protocol/process_stats_stub.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_PROTOCOL_PROCESS_STATS_STUB_H_
+#define REMOTING_PROTOCOL_PROCESS_STATS_STUB_H_
+
+#include "remoting/proto/process_stats.pb.h"
+
+namespace remoting {
+namespace protocol {
+
+// An interface to receive process statistic data.
+class ProcessStatsStub {
+ public:
+  ProcessStatsStub() = default;
+  virtual ~ProcessStatsStub() = default;
+
+  virtual void OnProcessStats(
+      const protocol::AggregatedProcessResourceUsage& usage) = 0;
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_PROCESS_STATS_STUB_H_