Early connection migration in QUIC.

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 94cf6dc2f11937855be5dd877e0e10be554e5b85..3aa63eaf912dd038faf78627f25b0ac45a5df9df 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -1218,6 +1218,8 @@ void IOThread::InitializeNetworkSessionParamsFromGlobals(
     params->quic_host_whitelist = globals.quic_host_whitelist;
   globals.quic_migrate_sessions_on_network_change.CopyToIfSet(
       &params->quic_migrate_sessions_on_network_change);
+  globals.quic_migrate_sessions_early.CopyToIfSet(
+      &params->quic_migrate_sessions_early);
   globals.origin_to_force_quic_on.CopyToIfSet(
       &params->origin_to_force_quic_on);
   params->enable_user_alternate_protocol_ports =
@@ -1364,6 +1366,8 @@ void IOThread::ConfigureQuicGlobals(
         GetQuicHostWhitelist(command_line, quic_trial_params);
     globals->quic_migrate_sessions_on_network_change.set(
         ShouldQuicMigrateSessionsOnNetworkChange(quic_trial_params));
+    globals->quic_migrate_sessions_early.set(
+        ShouldQuicMigrateSessionsEarly(quic_trial_params));
   }
 
   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
@@ -1663,6 +1667,12 @@ bool IOThread::ShouldQuicMigrateSessionsOnNetworkChange(
       "true");
 }
 
+bool IOThread::ShouldQuicMigrateSessionsEarly(
+    const VariationParameters& quic_trial_params) {
+  return base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "migrate_sessions_early"), "true");
+}
+
 size_t IOThread::GetQuicMaxPacketLength(
     const base::CommandLine& command_line,
     const VariationParameters& quic_trial_params) {