Experiment for number of persistent connections to server...

net/http/http_network_transaction.cc

 // Copyright (c) 2010 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 "net/http/http_network_transaction.h"
 
 #include "base/compiler_specific.h"
 #include "base/field_trial.h"
 #include "base/format_macros.h"
 #include "base/histogram.h"
@@ skipping 1581 matching lines @@
       total_duration,
       base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
       100);
 
   if (!reused_socket_) {
     UMA_HISTOGRAM_CLIPPED_TIMES(
         "Net.Transaction_Connected_New",
         total_duration,
         base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
         100);
+
+  static bool use_conn_count_impact =
+      FieldTrialList::Find("ConnCountImpact") &&
+      !FieldTrialList::Find("ConnCountImpact")->group_name().empty();
+  if (use_conn_count_impact) {
+    UMA_HISTOGRAM_CLIPPED_TIMES(
+        FieldTrial::MakeName("Net.Transaction_Connected_New",
+            "ConnCountImpact"),
+        total_duration,
+        base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
+        100);
+    }
   }
 
   // Currently, non-zero priority requests are frame or sub-frame resource
   // types.  This will change when we also prioritize certain subresources like
   // css, js, etc.
   if (request_->priority) {
     UMA_HISTOGRAM_CLIPPED_TIMES(
         "Net.Priority_High_Latency",
         total_duration,
         base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
@@ skipping 594 matching lines @@
       endpoint_);
 
   alternate_protocol_mode_ = kDoNotUseAlternateProtocol;
   if (connection_->socket())
     connection_->socket()->Disconnect();
   connection_->Reset();
   next_state_ = STATE_INIT_CONNECTION;
 }
 
 }  // namespace net