Revert of Revert of Add a new enable_nonblocking_io field trial param 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 1014 matching lines @@
   globals.quic_disable_connection_pooling.CopyToIfSet(
       &params->quic_disable_connection_pooling);
   globals.quic_load_server_info_timeout_ms.CopyToIfSet(
       &params->quic_load_server_info_timeout_ms);
   globals.quic_load_server_info_timeout_srtt_multiplier.CopyToIfSet(
       &params->quic_load_server_info_timeout_srtt_multiplier);
   globals.quic_enable_truncated_connection_ids.CopyToIfSet(
       &params->quic_enable_truncated_connection_ids);
   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_disable_disk_cache.CopyToIfSet(
       &params->quic_disable_disk_cache);
   globals.quic_socket_receive_buffer_size.CopyToIfSet(
       &params->quic_socket_receive_buffer_size);
   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);
@@ skipping 126 matching lines @@
     float load_server_info_timeout_srtt_multiplier =
         GetQuicLoadServerInfoTimeoutSrttMultiplier(quic_trial_params);
     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_truncated_connection_ids.set(
         ShouldQuicEnableTruncatedConnectionIds(quic_trial_params));
     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->enable_quic_port_selection.set(
         ShouldEnableQuicPortSelection(command_line));
     globals->quic_connection_options =
         GetQuicConnectionOptions(command_line, quic_trial_params);
     if (ShouldEnableQuicPacing(command_line, quic_trial_params)) {
       globals->quic_connection_options.push_back(net::kPACE);
     }
   }
@@ skipping 187 matching lines @@
 
 // static
 bool IOThread::ShouldQuicEnableConnectionRacing(
     const VariationParameters& quic_trial_params) {
   return LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "enable_connection_racing"),
       "true");
 }
 
 // static
+bool IOThread::ShouldQuicEnableNonBlockingIO(
+    const VariationParameters& quic_trial_params) {
+  return LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "enable_non_blocking_io"),
+      "true");
+}
+
+// static
 bool IOThread::ShouldQuicDisableDiskCache(
     const VariationParameters& quic_trial_params) {
   return LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "disable_disk_cache"), "true");
 }
 
 // static
 int IOThread::GetQuicSocketReceiveBufferSize(
     const VariationParameters& quic_trial_params) {
   int value;
@@ skipping 45 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;
 }