Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/test/connection_time_observer_unittest.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 <utility>
+
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+namespace test {
+
+class ConnectionTimeObserverTest : public ::testing::Test {
+ public:
+  ConnectionTimeObserverTest();
+  ~ConnectionTimeObserverTest() override;
+
+ protected:
+  // Test interface.
+  void SetUp() override;
+
+  // A map of fake times to calculate TimeDelta between two states.
+  std::map<protocol::ConnectionToHost::State, base::TimeTicks> test_map_;
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ConnectionTimeObserverTest);
+};
+
+ConnectionTimeObserverTest::ConnectionTimeObserverTest() {
+}
+
+ConnectionTimeObserverTest::~ConnectionTimeObserverTest() {
+}
+
+void ConnectionTimeObserverTest::SetUp() {
+  base::TimeTicks now = base::TimeTicks::Now();
+  test_map_.insert(std::make_pair(
+          protocol::ConnectionToHost::State::INITIALIZING,
+          now + base::TimeDelta::FromMilliseconds(10)));
+  test_map_.insert(std::make_pair(
+          protocol::ConnectionToHost::State::CONNECTING,
+          now + base::TimeDelta::FromMilliseconds(20)));
+  test_map_.insert(std::make_pair(
+          protocol::ConnectionToHost::State::AUTHENTICATED,
+          now + base::TimeDelta::FromMilliseconds(30)));
+  test_map_.insert(std::make_pair(
+          protocol::ConnectionToHost::State::CONNECTED,
+          now + base::TimeDelta::FromMilliseconds(40)));
+  test_map_.insert(std::make_pair(
+          protocol::ConnectionToHost::State::CLOSED,
+          now + base::TimeDelta::FromMilliseconds(50)));
+}
+
+TEST_F(ConnectionTimeObserverTest, ChromotingConnectionSuccess) {
+  ConnectionTimeObserver connection_time_observer;
+
+  connection_time_observer.SetTransitionTimesMapForTest(test_map_);
+
+  EXPECT_EQ(connection_time_observer.GetStateTransitionTime(
+      protocol::ConnectionToHost::State::INITIALIZING,
+      protocol::ConnectionToHost::State::CONNECTING).InMilliseconds(), 10);
+  EXPECT_EQ(connection_time_observer.GetStateTransitionTime(
+      protocol::ConnectionToHost::State::CONNECTING,
+      protocol::ConnectionToHost::State::AUTHENTICATED).InMilliseconds(), 10);
+  EXPECT_EQ(connection_time_observer.GetStateTransitionTime(
+      protocol::ConnectionToHost::State::AUTHENTICATED,
+      protocol::ConnectionToHost::State::CONNECTED).InMilliseconds(), 10);
+  EXPECT_EQ(connection_time_observer.GetStateTransitionTime(
+      protocol::ConnectionToHost::State::CONNECTED,
+      protocol::ConnectionToHost::State::CLOSED).InMilliseconds(), 10);
+}
+
+TEST_F(ConnectionTimeObserverTest, StartStateNotFound) {
+  ConnectionTimeObserver connection_time_observer;
+
+  connection_time_observer.SetTransitionTimesMapForTest(test_map_);
+
+  EXPECT_TRUE(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::FAILED,
+          protocol::ConnectionToHost::State::CLOSED).is_max());
+}
+
+TEST_F(ConnectionTimeObserverTest, EndStateNotFound) {
+  ConnectionTimeObserver connection_time_observer;
+
+  connection_time_observer.SetTransitionTimesMapForTest(test_map_);
+
+  EXPECT_TRUE(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::INITIALIZING,
+          protocol::ConnectionToHost::State::FAILED).is_max());
+}
+
+TEST_F(ConnectionTimeObserverTest, NegativeTransitionDelay) {
+  ConnectionTimeObserver connection_time_observer;
+
+  connection_time_observer.SetTransitionTimesMapForTest(test_map_);
+
+  EXPECT_TRUE(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::CLOSED,
+          protocol::ConnectionToHost::State::INITIALIZING).is_max());
+}
+
+TEST_F(ConnectionTimeObserverTest, TestOnConnectionStateChangedWithTestMap) {
+  ConnectionTimeObserver connection_time_observer;
+
+  connection_time_observer.SetTransitionTimesMapForTest(test_map_);
+
+  // Should fail to find FAILED.
+  EXPECT_TRUE(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::INITIALIZING,
+          protocol::ConnectionToHost::State::FAILED).is_max());
+
+  // Registers the time at which FAILED state occurred into the map.
+  connection_time_observer.ConnectionStateChanged(
+      protocol::ConnectionToHost::State::FAILED,
+      protocol::ErrorCode::PEER_IS_OFFLINE);
+
+  EXPECT_FALSE(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::INITIALIZING,
+          protocol::ConnectionToHost::State::FAILED).is_zero());
+}
+
+TEST_F(ConnectionTimeObserverTest, TestOnConnectionStateChangedWithoutTestMap) {
+  ConnectionTimeObserver connection_time_observer;
+
+  base::MessageLoopForIO message_loop;
+  base::RunLoop run_loop;
+
+  // Should fail to find INITIALIZING in an empty map.
+  EXPECT_TRUE(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::INITIALIZING,
+          protocol::ConnectionToHost::State::FAILED).is_max());
+
+  connection_time_observer.Initialize();
+  connection_time_observer.ConnectionStateChanged(
+      protocol::ConnectionToHost::State::CONNECTING,
+      protocol::ErrorCode::OK);
+  connection_time_observer.ConnectionStateChanged(
+      protocol::ConnectionToHost::State::AUTHENTICATED,
+      protocol::ErrorCode::OK);
+
+  // Wait for 10 milliseconds for CONNECTED state.
+  // Note: This test can only guarantee a positive TimeDelta between a previous
+  // state and the CONNECTED state. Prior states have non-deterministic times
+  // between each other.
+  base::Timer timer(true, false);
+  timer.Start(FROM_HERE,
+              base::TimeDelta::FromMilliseconds(10),
+              run_loop.QuitClosure());
+  run_loop.Run();
+
+  connection_time_observer.ConnectionStateChanged(
+      protocol::ConnectionToHost::State::CONNECTED,
+      protocol::ErrorCode::OK);
+
+  // Verify that the time waited is positive and exactly 10 milliseconds.

[joedow, 2015/07/27 21:45:44]

I don't think this will work consistently.  Posting a delayed task (say for 10ms
in the future) is not guaranteed to run in exactly 10ms, it could take longer. 
You could make this a greater than check to be safe.

[tonychun, 2015/07/28 17:53:45]

Done.

+  EXPECT_EQ(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::AUTHENTICATED,
+          protocol::ConnectionToHost::State::CONNECTED).InMilliseconds(), 10);
+}
+
+TEST_F(ConnectionTimeObserverTest, TestOnConnectionStateDataDoesNotChange) {
+  ConnectionTimeObserver connection_time_observer;
+
+  connection_time_observer.SetTransitionTimesMapForTest(test_map_);
+
+  base::TimeDelta first_time_delta =
+      connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::INITIALIZING,
+          protocol::ConnectionToHost::State::CONNECTED);
+
+  // This check makes sure that the two states are actually found.
+  EXPECT_FALSE(first_time_delta.is_zero());
+
+  // The initial data should not change and should log an error.
+  connection_time_observer.ConnectionStateChanged(
+      protocol::ConnectionToHost::State::CONNECTED, protocol::ErrorCode::OK);
+
+  EXPECT_EQ(connection_time_observer.GetStateTransitionTime(
+          protocol::ConnectionToHost::State::INITIALIZING,
+          protocol::ConnectionToHost::State::CONNECTED), first_time_delta);
+}
+
+}  // namespace test
+}  // namespace remoting