Introduce a policy to control the maximal number of connections per proxy server.

chrome/browser/browser_main.cc

Index: chrome/browser/browser_main.cc
diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index d31fe38d8e6fe6a9f2d86bfad5ebebf6eddb2ca7..d79e4f4927cdd82fd5295be564d1a20b9a704654 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -277,7 +277,9 @@ MetricsService* BrowserMainParts::SetupMetricsAndFieldTrials(
   // to send metrics.
   field_trial_list_.reset(new base::FieldTrialList(metrics->GetClientId()));
 
-  SetupFieldTrials(metrics->recording_active());
+  SetupFieldTrials(metrics->recording_active(),
+                   local_state->IsManagedPreference(
+                       prefs::kMaxConnectionsPerProxy));
 
   // Initialize FieldTrialSynchronizer system. This is a singleton and is used
   // for posting tasks via NewRunnableMethod. Its deleted when it goes out of
@@ -633,7 +635,8 @@ MetricsService* BrowserMainParts::InitializeMetrics(
   return metrics;
 }
 
-void BrowserMainParts::SetupFieldTrials(bool metrics_recording_enabled) {
+void BrowserMainParts::SetupFieldTrials(bool metrics_recording_enabled,
+                                        bool proxy_policy_is_set) {
   if (metrics_recording_enabled)
     chrome_browser_net_websocket_experiment::WebSocketExperimentRunner::Start();
 
@@ -641,7 +644,10 @@ void BrowserMainParts::SetupFieldTrials(bool metrics_recording_enabled) {
   // ProxyConnectionsFieldTrial().
   ConnectionFieldTrial();
   SocketTimeoutFieldTrial();
-  ProxyConnectionsFieldTrial();
+  // If a policy is defining the number of active connections this field test
+  // shoud not be performed.
+  if (!proxy_policy_is_set)
+    ProxyConnectionsFieldTrial();
   prerender::ConfigurePrefetchAndPrerender(parsed_command_line());
   SpdyFieldTrial();
   ConnectBackupJobsFieldTrial();