Supporting command line argument to force field trials

chrome/browser/autocomplete/autocomplete_field_trial.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/autocomplete/autocomplete_field_trial.h"
 
 #include <string>
 
 #include "base/metrics/field_trial.h"
 #include "base/stringprintf.h"
@@ skipping 46 matching lines @@
   // get ingrained, users tend to learn that a particular suggestion is
   // at a particular spot in the drop-down--we're going to make these
   // field trials sticky.  We want users to stay in them once assigned
   // so they have a better experience and also so we don't get weird
   // effects as omnibox ranking keeps changing and users learn they can't
   // trust the omnibox.  Hence, to create the field trials we require
   // that field trials can be made sticky.
   if (base::FieldTrialList::IsOneTimeRandomizationEnabled()) {  // sticky trials
     // Create aggressive History URL Provider field trial.
     // Make it expire on August 1, 2012.
-    scoped_refptr<base::FieldTrial> trial(new base::FieldTrial(
-        kAggressiveHUPFieldTrialName, kAggressiveHUPFieldTrialDivisor,
-        "Standard", 2012, 8, 1));
+    scoped_refptr<base::FieldTrial> trial(
+        base::FieldTrialList::GetFieldTrialInstance(
+            kAggressiveHUPFieldTrialName, kAggressiveHUPFieldTrialDivisor,
+            "Standard", NULL, 2012, 8, 1));
     trial->UseOneTimeRandomization();
     aggressive_hup_experiment_group = trial->AppendGroup("Aggressive",
         kAggressiveHUPFieldTrialExperimentFraction);
 
     // Create inline History Quick Provider field trial.
     // Make it expire on November 8, 2012.
-    trial = new base::FieldTrial(
+    trial = base::FieldTrialList::GetFieldTrialInstance(
         kDisallowInlineHQPFieldTrialName, kDisallowInlineHQPFieldTrialDivisor,
-        "Standard", 2012, 11, 8);
+        "Standard", NULL, 2012, 11, 8);
     trial->UseOneTimeRandomization();
     disallow_inline_hqp_experiment_group = trial->AppendGroup("DisallowInline",
         kDisallowInlineHQPFieldTrialExperimentFraction);
   }
 
   // Create the suggest field trial (regardless of sticky-ness status, but
   // make it sticky if possible).
   // Make it expire on October 1, 2012.
-  scoped_refptr<base::FieldTrial> trial(new base::FieldTrial(
-      kSuggestFieldTrialName, kSuggestFieldTrialNumberOfGroups,
-      "0", 2012, 10, 1));
+  scoped_refptr<base::FieldTrial> trial(
+      base::FieldTrialList::GetFieldTrialInstance(
+        kSuggestFieldTrialName, kSuggestFieldTrialNumberOfGroups,
+        "0", NULL, 2012, 10, 1));
   if (base::FieldTrialList::IsOneTimeRandomizationEnabled())
     trial->UseOneTimeRandomization();
   // We've already created one group; now just need to create
   // kSuggestFieldTrialNumGroups - 1 more.
   for (int i = 1; i < kSuggestFieldTrialNumberOfGroups; i++)
     trial->AppendGroup(base::StringPrintf("%d", i), 1);
 }
 
 bool AutocompleteFieldTrial::InAggressiveHUPFieldTrial() {
   return base::FieldTrialList::TrialExists(kAggressiveHUPFieldTrialName);
@@ skipping 40 matching lines @@
 // get numbers that we know are 0, 1, 2, ...
 int AutocompleteFieldTrial::GetSuggestGroupNameAsNumber() {
   int group_num;
   base::StringToInt(GetSuggestGroupName(), &group_num);
   return group_num;
 }
 
 int AutocompleteFieldTrial::GetSuggestNumberOfGroups() {
   return kSuggestFieldTrialNumberOfGroups;
 }