QUIC - added disable_delay_tcp_race field trial param to disable delaying of racing TCP connection

chrome/browser/io_thread_unittest.cc

Index: chrome/browser/io_thread_unittest.cc
diff --git a/chrome/browser/io_thread_unittest.cc b/chrome/browser/io_thread_unittest.cc
index dca30be5f2ae7a5fd0095a847674183a65abfbe8..85eec32c6957465a9a154b3594b4dbe427116353 100644
--- a/chrome/browser/io_thread_unittest.cc
+++ b/chrome/browser/io_thread_unittest.cc
@@ -251,7 +251,7 @@ TEST_F(NetworkSessionConfiguratorTest, EnableQuicFromFieldTrialGroup) {
   EXPECT_FALSE(params_.enable_alternative_service_with_different_host);
   EXPECT_EQ(0, params_.quic_max_number_of_lossy_connections);
   EXPECT_EQ(1.0f, params_.quic_packet_loss_threshold);
-  EXPECT_FALSE(params_.quic_delay_tcp_race);
+  EXPECT_TRUE(params_.quic_delay_tcp_race);
   EXPECT_FALSE(params_.quic_close_sessions_on_ip_change);
   EXPECT_EQ(net::kIdleConnectionTimeoutSeconds,
             params_.quic_idle_connection_timeout_seconds);
@@ -577,7 +577,7 @@ TEST_F(NetworkSessionConfiguratorTest, QuicReceiveBufferSize) {
   EXPECT_EQ(2097152, params_.quic_socket_receive_buffer_size);
 }
 
-TEST_F(NetworkSessionConfiguratorTest, QuicDelayTcpConnection) {
+TEST_F(NetworkSessionConfiguratorTest, QuicDelayTcpRace) {
   std::map<std::string, std::string> field_trial_params;
   field_trial_params["delay_tcp_race"] = "true";
   variations::AssociateVariationParams("QUIC", "Enabled", field_trial_params);
@@ -588,6 +588,18 @@ TEST_F(NetworkSessionConfiguratorTest, QuicDelayTcpConnection) {
   EXPECT_TRUE(params_.quic_delay_tcp_race);
 }
 
+TEST_F(NetworkSessionConfiguratorTest, QuicWithNoDelayTcpRaceParam) {
+  std::map<std::string, std::string> field_trial_params;
+  variations::AssociateVariationParams("QUIC", "Enabled", field_trial_params);
+  base::FieldTrialList::CreateFieldTrial("QUIC", "Enabled");
+
+  ParseFieldTrials();
+
+  // If there is no delay_tcp_race field trial param, then it should default to
+  // true.
+  EXPECT_TRUE(params_.quic_delay_tcp_race);
+}
+
 TEST_F(NetworkSessionConfiguratorTest, QuicOriginsToForceQuicOn) {
   base::CommandLine::ForCurrentProcess()->AppendSwitch("enable-quic");
   base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(