Add a new prefer_aes finch options for QUIC.

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 1156 matching lines @@
   globals.quic_always_require_handshake_confirmation.CopyToIfSet(
       &params->quic_always_require_handshake_confirmation);
   globals.quic_disable_connection_pooling.CopyToIfSet(
       &params->quic_disable_connection_pooling);
   globals.quic_load_server_info_timeout_srtt_multiplier.CopyToIfSet(
       &params->quic_load_server_info_timeout_srtt_multiplier);
   globals.quic_enable_connection_racing.CopyToIfSet(
       &params->quic_enable_connection_racing);
   globals.quic_enable_non_blocking_io.CopyToIfSet(
       &params->quic_enable_non_blocking_io);
+  globals.quic_prefer_aes.CopyToIfSet(&params->quic_prefer_aes);
   globals.quic_disable_disk_cache.CopyToIfSet(
       &params->quic_disable_disk_cache);
   globals.quic_max_number_of_lossy_connections.CopyToIfSet(
       &params->quic_max_number_of_lossy_connections);
   globals.quic_packet_loss_threshold.CopyToIfSet(
       &params->quic_packet_loss_threshold);
   globals.quic_socket_receive_buffer_size.CopyToIfSet(
       &params->quic_socket_receive_buffer_size);
   globals.enable_quic_port_selection.CopyToIfSet(
       &params->enable_quic_port_selection);
@@ skipping 127 matching lines @@
     if (load_server_info_timeout_srtt_multiplier != 0) {
       globals->quic_load_server_info_timeout_srtt_multiplier.set(
           load_server_info_timeout_srtt_multiplier);
     }
     globals->quic_enable_connection_racing.set(
         ShouldQuicEnableConnectionRacing(quic_trial_params));
     globals->quic_enable_non_blocking_io.set(
         ShouldQuicEnableNonBlockingIO(quic_trial_params));
     globals->quic_disable_disk_cache.set(
         ShouldQuicDisableDiskCache(quic_trial_params));
+    globals->quic_prefer_aes.set(
+        ShouldQuicPreferAes(quic_trial_params));
     int max_number_of_lossy_connections = GetQuicMaxNumberOfLossyConnections(
         quic_trial_params);
     if (max_number_of_lossy_connections != 0) {
       globals->quic_max_number_of_lossy_connections.set(
           max_number_of_lossy_connections);
     }
     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(
@@ skipping 191 matching lines @@
 }
 
 // static
 bool IOThread::ShouldQuicDisableDiskCache(
     const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "disable_disk_cache"), "true");
 }
 
 // static
+bool IOThread::ShouldQuicPreferAes(
+    const VariationParameters& quic_trial_params) {
+  return base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "prefer_aes"), "true");
+}
+
+// static
 int IOThread::GetQuicMaxNumberOfLossyConnections(
     const VariationParameters& quic_trial_params) {
   int value;
   if (base::StringToInt(GetVariationParam(quic_trial_params,
                                           "max_number_of_lossy_connections"),
                         &value)) {
     return value;
   }
   return 0;
 }
@@ skipping 62 matching lines @@
   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
   for (size_t i = 0; i < supported_versions.size(); ++i) {
     net::QuicVersion version = supported_versions[i];
     if (net::QuicVersionToString(version) == quic_version) {
       return version;
     }
   }
 
   return net::QUIC_VERSION_UNSUPPORTED;
 }