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

chrome/browser/io_thread.cc

 // Copyright (c) 2012 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 "chrome/browser/io_thread.h"
 
 #include <vector>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 1064 matching lines @@
   globals.quic_delay_tcp_race.CopyToIfSet(&params->quic_delay_tcp_race);
   globals.enable_quic_port_selection.CopyToIfSet(
       &params->enable_quic_port_selection);
   globals.quic_max_packet_length.CopyToIfSet(&params->quic_max_packet_length);
   globals.quic_user_agent_id.CopyToIfSet(&params->quic_user_agent_id);
   globals.quic_supported_versions.CopyToIfSet(
       &params->quic_supported_versions);
   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_net_change.CopyToIfSet(
+      &params->quic_migrate_sessions_on_net_change);
 
   globals.origin_to_force_quic_on.CopyToIfSet(
       &params->origin_to_force_quic_on);
   params->enable_user_alternate_protocol_ports =
       globals.enable_user_alternate_protocol_ports;
 }
 
 base::TimeTicks IOThread::creation_time() const {
   return creation_time_;
 }
@@ skipping 117 matching lines @@
     }
     float packet_loss_threshold = GetQuicPacketLossThreshold(quic_trial_params);
     if (packet_loss_threshold != 0)
       globals->quic_packet_loss_threshold.set(packet_loss_threshold);
     globals->enable_quic_port_selection.set(
         ShouldEnableQuicPortSelection(command_line));
     globals->quic_connection_options =
         GetQuicConnectionOptions(command_line, quic_trial_params);
     globals->quic_close_sessions_on_ip_change.set(
         ShouldQuicCloseSessionsOnIpChange(quic_trial_params));
+    globals->quic_migrate_sessions_on_net_change.set(
+        ShouldQuicMigrateSessionsOnNetChange(quic_trial_params));
   }
 
   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
                                                     quic_trial_params);
   if (max_packet_length != 0) {
     globals->quic_max_packet_length.set(max_packet_length);
   }
 
   std::string quic_user_agent_id = chrome::GetChannelString();
   if (!quic_user_agent_id.empty())
@@ skipping 232 matching lines @@
       GetVariationParam(quic_trial_params, "delay_tcp_race"), "true");
 }
 
 bool IOThread::ShouldQuicCloseSessionsOnIpChange(
     const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "close_sessions_on_ip_change"),
       "true");
 }
 
+bool IOThread::ShouldQuicMigrateSessionsOnNetChange(
+    const VariationParameters& quic_trial_params) {
+#if defined(OS_ANDROID)
+      && base::android::BuildInfo::GetInstance()->sdk_int() >=
+      base::android::SDK_VERSION_LOLLIPOP
+  // Migration only implemented for Android versions >= L.
+  return base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "migrate_sessions_on_net_change"),
+      "true");
+#endif
+  return false;
+}
+
 size_t IOThread::GetQuicMaxPacketLength(
     const base::CommandLine& command_line,
     const VariationParameters& quic_trial_params) {
   if (command_line.HasSwitch(switches::kQuicMaxPacketLength)) {
     unsigned value;
     if (!base::StringToUint(
             command_line.GetSwitchValueASCII(switches::kQuicMaxPacketLength),
             &value)) {
       return 0;
     }
@@ skipping 158 matching lines @@
   globals->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
 
   context->set_job_factory(
       globals->proxy_script_fetcher_url_request_job_factory.get());
 
   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
   // system URLRequestContext too. There's no reason this should be tied to a
   // profile.
   return context;
 }