Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/test/connection_time_observer.cc

+// Copyright 2015 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/test/connection_time_observer.h"
+
+#include "base/time/time.h"
+
+namespace {
+
+std::string GetStateAsString(
+    const remoting::protocol::ConnectionToHost::State& state) {
+  switch (state) {
+    case remoting::protocol::ConnectionToHost::State::INITIALIZING:
+      return "INITIALIZING";
+    case remoting::protocol::ConnectionToHost::State::CONNECTING:
+      return "CONNECTING";
+    case remoting::protocol::ConnectionToHost::State::AUTHENTICATED:
+      return "AUTHENTICATED";
+    case remoting::protocol::ConnectionToHost::State::CONNECTED:
+      return "CONNECTED";
+    case remoting::protocol::ConnectionToHost::State::FAILED:
+      return "FAILED";
+    case remoting::protocol::ConnectionToHost::State::CLOSED:
+      return "CLOSED";
+    default:
+      LOG(ERROR) << "Unknown current state";
+      NOTREACHED();
+  }
+}
+
+}  // namespace
+
+namespace remoting {
+namespace test {
+
+ConnectionTimeObserver::ConnectionTimeObserver()
+    : current_state_(protocol::ConnectionToHost::State::INITIALIZING),

[Sergey Ulanov, 2015/07/20 23:04:04]

nit: move this initializer to .h

[tonychun, 2015/07/23 03:31:04]

Done.

+      last_state_change_time_ticks(base::TimeTicks::Now()) {
+}
+
+ConnectionTimeObserver::~ConnectionTimeObserver() {
+}
+
+void ConnectionTimeObserver::ConnectionStateChanged(
+    protocol::ConnectionToHost::State state,
+    protocol::ErrorCode error_code) {
+  int state_change_time =
+      (base::TimeTicks::Now() - last_state_change_time_ticks).InMilliseconds();
+
+  std::string current_state_string = GetStateAsString(current_state_);
+  std::string next_state_string = GetStateAsString(state);
+
+  VLOG(1) << current_state_string << " to " << next_state_string
+          << " Delta Time: " << state_change_time << " ms";
+
+  current_state_ = state;
+  last_state_change_time_ticks = base::TimeTicks::Now();
+}
+
+}  // namespace test
+}  // namespace remoting