Adding show profile switcher field trial.

chrome/browser/chrome_browser_field_trials.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/chrome_browser_field_trials.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/auto_launch_trial.h"
 #include "chrome/browser/autocomplete/autocomplete_field_trial.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/gpu/chrome_gpu_util.h"
 #include "chrome/browser/metrics/variations/variations_service.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
+#include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
 #include "chrome/browser/ui/sync/one_click_signin_helper.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/metrics/variations/variations_util.h"
 #include "net/socket/client_socket_pool_base.h"
 #include "net/spdy/spdy_session.h"
 #include "ui/base/layout.h"
 
 #if defined(OS_WIN)
@@ skipping 106 matching lines @@
   prerender::ConfigurePrefetchAndPrerender(parsed_command_line_);
   SpdyFieldTrial();
   WarmConnectionFieldTrial();
   AutoLaunchChromeFieldTrial();
   gpu_util::InitializeCompositingFieldTrial();
   SetupUniformityFieldTrials(install_time);
   AutocompleteFieldTrial::ActivateStaticTrials();
   DisableNewTabFieldTrialIfNecesssary();
   SetUpInfiniteCacheFieldTrial();
   SetUpCacheSensitivityAnalysisFieldTrial();
+  DisableShowProfileSwitcherTrialIfNecessary();
   WindowsOverlappedTCPReadsFieldTrial();
 #if defined(ENABLE_ONE_CLICK_SIGNIN)
   OneClickSigninHelper::InitializeFieldTrial();
 #endif
   InstantiateDynamicTrials();
 }
 
 // When --use-spdy not set, users will be in A/B test for spdy.
 // group A (npn_with_spdy): this means npn and spdy are enabled. In case server
 //                          supports spdy, browser will use spdy.
@@ skipping 132 matching lines @@
   base::FieldTrial::Probability infinite_cache_probability = 0;
 
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial("InfiniteCache", kDivisor,
                                                  "No", 2013, 12, 31, NULL));
   trial->UseOneTimeRandomization();
   trial->AppendGroup("Yes", infinite_cache_probability);
   trial->AppendGroup("Control", infinite_cache_probability);
 }
 
+void ChromeBrowserFieldTrials::DisableShowProfileSwitcherTrialIfNecessary() {
+  // This trial is created by the VariationsService, but it needs to be disabled
+  // if multi-profiles isn't enabled.
+  base::FieldTrial* trial = base::FieldTrialList::Find("ShowProfileSwitcher");
+  if (trial && !ProfileManager::IsMultipleProfilesEnabled())
+    trial->Disable();
+}
+
 void ChromeBrowserFieldTrials::SetUpCacheSensitivityAnalysisFieldTrial() {
   const base::FieldTrial::Probability kDivisor = 100;
 
   base::FieldTrial::Probability sensitivity_analysis_probability = 0;
 
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial("CacheSensitivityAnalysis",
                                                  kDivisor, "No",
                                                  2012, 12, 31, NULL));
   trial->AppendGroup("ControlA", sensitivity_analysis_probability);
@@ skipping 33 matching lines @@
   // Call |FindValue()| on the trials below, which may come from the server, to
   // ensure they get marked as "used" for the purposes of data reporting.
   base::FieldTrialList::FindValue("UMA-Dynamic-Binary-Uniformity-Trial");
   base::FieldTrialList::FindValue("UMA-Dynamic-Uniformity-Trial");
   base::FieldTrialList::FindValue("InstantDummy");
   base::FieldTrialList::FindValue("InstantChannel");
   base::FieldTrialList::FindValue("Test0PercentDefault");
   // Activate the autocomplete dynamic field trials.
   AutocompleteFieldTrial::ActivateDynamicTrials();
 }