diff --git a/chrome/browser/browser_main.h b/chrome/browser/browser_main.h
index 417c622..e13a12d 100644
--- a/chrome/browser/browser_main.h
+++ b/chrome/browser/browser_main.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "base/basictypes.h"
+#include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/tracked_objects.h"
@@ -129,6 +130,9 @@
   // specified timeout value is reached.
   void ConnectBackupJobsFieldTrial();
 
+  // A/B test for warmest socket vs. most recently used socket.
+  void WarmConnectionFieldTrial();
+
   // Used to initialize NSPR where appropriate.
   virtual void InitializeSSL() = 0;
 
@@ -171,6 +175,9 @@
   // Initialized in SetupMetricsAndFieldTrials.
   scoped_refptr<FieldTrialSynchronizer> field_trial_synchronizer_;
 
+  FRIEND_TEST(BrowserMainTest, WarmConnectionFieldTrial_WarmestSocket);
+  FRIEND_TEST(BrowserMainTest, WarmConnectionFieldTrial_Random);
+  FRIEND_TEST(BrowserMainTest, WarmConnectionFieldTrial_Invalid);
   DISALLOW_COPY_AND_ASSIGN(BrowserMainParts);
 };