Migrates QUIC sessions to a new network when old network is (about to be) disconnected.

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 c1d23a319e5d663ec868fbc56a5e1b2f3b65628d..4c08ee4d4daac571b1ca89d7dca5632288aaf6f0 100644
--- a/chrome/browser/io_thread_unittest.cc
+++ b/chrome/browser/io_thread_unittest.cc
@@ -234,6 +234,7 @@ TEST_F(IOThreadTest, EnableQuicFromFieldTrialGroup) {
   EXPECT_EQ(net::kIdleConnectionTimeoutSeconds,
             params.quic_idle_connection_timeout_seconds);
   EXPECT_FALSE(params.quic_disable_preconnect_if_0rtt);
+  EXPECT_FALSE(params.quic_migrate_sessions_on_network_change);
   EXPECT_FALSE(IOThread::ShouldEnableQuicForDataReductionProxy());
   EXPECT_TRUE(params.quic_host_whitelist.empty());
 }
@@ -349,6 +350,15 @@ TEST_F(IOThreadTest, QuicDisablePreConnectIfZeroRtt) {
   EXPECT_TRUE(params.quic_disable_preconnect_if_0rtt);
 }
 
+TEST_F(IOThreadTest, QuicMigrateSessionsOnNetworkChangeFromFieldTrialParams) {
+  field_trial_group_ = "Enabled";
+  field_trial_params_["migrate_sessions_on_network_change"] = "true";
+  ConfigureQuicGlobals();
+  net::HttpNetworkSession::Params params;
+  InitializeNetworkSessionParams(&params);
+  EXPECT_TRUE(params.quic_migrate_sessions_on_network_change);
+}
+
 TEST_F(IOThreadTest, PacketLengthFromFieldTrialParams) {
   field_trial_group_ = "Enabled";
   field_trial_params_["max_packet_length"] = "1450";