Add a new NetworkActivityMonitor to track network activity

net/base/network_activity_monitor_unittest.cc

+// Copyright (c) 2014 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 "net/base/network_activity_monitor.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace test {
+
+class NetworkActivityMonitorPeer {
+ public:
+  static NetworkActivityMonitor* CreateMonitor() {
+    return new NetworkActivityMonitor();
+  }
+};
+
+TEST(NetworkActivityMontiorTest, GetInstance) {
+  NetworkActivityMonitor* monitor = NetworkActivityMonitor::GetInstance();
+  EXPECT_TRUE(monitor != NULL);
+  EXPECT_TRUE(monitor == NetworkActivityMonitor::GetInstance());
+}
+
+TEST(NetworkActivityMontiorTest, BytesRead) {
+  NetworkActivityMonitor* monitor = NetworkActivityMonitorPeer::CreateMonitor();
+  EXPECT_EQ(0u, monitor->GetBytesRead());
+  uint64 delta = 12345;
+  monitor->AddBytesRead(delta);
+  EXPECT_EQ(delta, monitor->GetBytesRead());
+}
+
+TEST(NetworkActivityMontiorTest, BytesWritten) {
+  NetworkActivityMonitor* monitor = NetworkActivityMonitorPeer::CreateMonitor();

[eroman, 2014/11/13 22:18:39]

I suggest also adding a test that posts tasks to a threadpool, to exercise
concurrent add/get.

Could maybe add on 3 different threads, then once it is all done retrieve and
make sure total was correct.

(Will give TSAN an opportunity to verify stuff).

[Ryan Hamilton, 2014/11/13 23:38:18]

Done.

+  EXPECT_EQ(0u, monitor->GetBytesWritten());
+  uint64 delta = 12345;
+  monitor->AddBytesWritten(delta);
+  EXPECT_EQ(delta, monitor->GetBytesWritten());
+}
+
+}  // namespace test
+
+}  // namespace net