Enable QUIC for proxies based on Finch config and command line switch.

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 9ef53eeac4556f6865d2b244199b8d94a453161e..89e0693b134952bdb7dcfc24177b82162eed7c2d 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -41,6 +41,7 @@
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/pref_names.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
+#include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/variations/variations_associated_data.h"
 #include "content/public/browser/browser_thread.h"
@@ -1030,6 +1031,7 @@ void IOThread::InitializeNetworkSessionParamsFromGlobals(
       &params->alternate_protocol_probability_threshold);
 
   globals.enable_quic.CopyToIfSet(&params->enable_quic);
+  globals.enable_quic_for_proxies.CopyToIfSet(&params->enable_quic_for_proxies);
   globals.quic_always_require_handshake_confirmation.CopyToIfSet(
       &params->quic_always_require_handshake_confirmation);
   globals.quic_disable_connection_pooling.CopyToIfSet(
@@ -1150,6 +1152,9 @@ void IOThread::ConfigureQuicGlobals(
     IOThread::Globals* globals) {
   bool enable_quic = ShouldEnableQuic(command_line, quic_trial_group);
   globals->enable_quic.set(enable_quic);
+  bool enable_quic_for_proxies = ShouldEnableQuicForProxies(command_line,
+                                                            quic_trial_group);
+  globals->enable_quic_for_proxies.set(enable_quic_for_proxies);
   if (enable_quic) {
     globals->quic_always_require_handshake_confirmation.set(
         ShouldQuicAlwaysRequireHandshakeConfirmation(quic_trial_params));
@@ -1229,6 +1234,25 @@ bool IOThread::ShouldEnableQuic(const base::CommandLine& command_line,
       quic_trial_group.starts_with(kQuicFieldTrialHttpsEnabledGroupName);
 }
 
+// static
+std::string IOThread::QuicFieldTrialName() {
+  std::string group =
+        base::FieldTrialList::FindFullName(kQuicFieldTrialName);
+  return group;
+}
+
+// static
+bool IOThread::ShouldEnableQuicForProxies(
+    const base::CommandLine& command_line,
+    base::StringPiece quic_trial_group) {
+  if (command_line.HasSwitch(switches::kDisableQuic))
+    return false;
+
+  return ShouldEnableQuic(command_line, quic_trial_group) ||
+         data_reduction_proxy::DataReductionProxyParams::
+             IsIncludedInUseQUICFieldTrial();
+}
+
 bool IOThread::ShouldEnableQuicPortSelection(
     const base::CommandLine& command_line) {
   if (command_line.HasSwitch(switches::kDisableQuicPortSelection))