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

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 2301ab5ab5965f00311c4b15320e022f4d42f313..977bff0d0c71632842461baaa8a9c6d3c49128e8 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -1107,7 +1107,8 @@ void IOThread::InitializeNetworkSessionParamsFromGlobals(
   params->quic_connection_options = globals.quic_connection_options;
   globals.quic_close_sessions_on_ip_change.CopyToIfSet(
       &params->quic_close_sessions_on_ip_change);
-
+  globals.quic_migrate_sessions_on_network_change.CopyToIfSet(
+      &params->quic_migrate_sessions_on_network_change);
   globals.origin_to_force_quic_on.CopyToIfSet(
       &params->origin_to_force_quic_on);
   params->enable_user_alternate_protocol_ports =
@@ -1242,6 +1243,8 @@ void IOThread::ConfigureQuicGlobals(
         GetQuicConnectionOptions(command_line, quic_trial_params);
     globals->quic_close_sessions_on_ip_change.set(
         ShouldQuicCloseSessionsOnIpChange(quic_trial_params));
+    globals->quic_migrate_sessions_on_network_change.set(
+        ShouldQuicMigrateSessionsOnNetworkChange(quic_trial_params));
   }
 
   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
@@ -1483,6 +1486,16 @@ bool IOThread::ShouldQuicCloseSessionsOnIpChange(
       "true");
 }
 
+bool IOThread::ShouldQuicMigrateSessionsOnNetworkChange(
+    const VariationParameters& quic_trial_params) {
+  return base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params,
+                        "migrate_sessions_on_network_change"),
+      "true");
+#endif

[Ryan Hamilton, 2015/11/18 22:23:35]

Does this build? Remove this?

[Jana, 2015/11/21 02:21:22]

Yeah -- I fixed it later. I had tried just building net, which worked fine :-)

+  return false;
+}
+
 size_t IOThread::GetQuicMaxPacketLength(
     const base::CommandLine& command_line,
     const VariationParameters& quic_trial_params) {