Adding show profile switcher field trial.

chrome/browser/profiles/avatar_menu_model.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/profiles/avatar_menu_model.h"
 
 #include "base/bind.h"
+#include "base/metrics/field_trial.h"
 #include "base/stl_util.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/avatar_menu_model_observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_info_util.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profile_metrics.h"
@@ skipping 23 matching lines @@
   if (status == Profile::CREATE_STATUS_INITIALIZED) {
     ProfileManager::FindOrCreateNewWindowForProfile(
         profile,
         chrome::startup::IS_NOT_PROCESS_STARTUP,
         chrome::startup::IS_NOT_FIRST_RUN,
         desktop_type,
         always_create);
   }
 }
 
+// Constants for the show profile switcher experiment
+const char kShowProfileSwitcherFieldTrialName[] = "ShowProfileSwitcher";
+const char kAlwaysShowSwitcherGroupName[] = "AlwaysShow";
+
 }  // namespace
 
 AvatarMenuModel::AvatarMenuModel(ProfileInfoInterface* profile_cache,
                                  AvatarMenuModelObserver* observer,
                                  Browser* browser)
     : profile_info_(profile_cache),
       observer_(observer),
       browser_(browser) {
   DCHECK(profile_info_);
   // Don't DCHECK(browser_) so that unit tests can reuse this ctor.
@@ skipping 99 matching lines @@
                               const content::NotificationSource& source,
                               const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_PROFILE_CACHED_INFO_CHANGED, type);
   RebuildMenu();
   if (observer_)
     observer_->OnAvatarMenuModelChanged(this);
 }
 
 // static
 bool AvatarMenuModel::ShouldShowAvatarMenu() {
+  if (base::FieldTrialList::FindFullName(kShowProfileSwitcherFieldTrialName) ==
+      kAlwaysShowSwitcherGroupName) {
+    // We should only be in this group when multi-profiles is enabled.
+    DCHECK(ProfileManager::IsMultipleProfilesEnabled());
+    return true;
+  }
   return ProfileManager::IsMultipleProfilesEnabled() &&
       g_browser_process->profile_manager()->GetNumberOfProfiles() > 1;
 }
 
 void AvatarMenuModel::RebuildMenu() {
   ClearMenu();
 
   const size_t count = profile_info_->GetNumberOfProfiles();
   for (size_t i = 0; i < count; ++i) {
     bool is_gaia_picture =
@@ skipping 14 matching lines @@
       FilePath path = profile_info_->GetPathOfProfileAtIndex(i);
       item->active = browser_->profile()->GetPath() == path;
     }
     items_.push_back(item);
   }
 }
 
 void AvatarMenuModel::ClearMenu() {
   STLDeleteElements(&items_);
 }