Enable profile switching for standalone App Launcher via the Settings App.

chrome/browser/chrome_browser_main.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_main.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 316 matching lines @@
     ListPrefUpdate update(g_browser_process->local_state(),
                           prefs::kProfilesLastActive);
     ListValue* profile_list = update.Get();
     profile_list->Clear();
   }
 #if defined(OS_CHROMEOS)
   // TODO(ivankr): http://crbug.com/83792
   profile = g_browser_process->profile_manager()->GetDefaultProfile(
       user_data_dir);
 #else
-  profile = g_browser_process->profile_manager()->GetLastUsedProfile(
-      user_data_dir);
+  if (parsed_command_line.HasSwitch(switches::kShowAppList)) {
+    profile = g_browser_process->profile_manager()->GetAppListProfile(
+        user_data_dir);
+  } else {
+    profile = g_browser_process->profile_manager()->GetLastUsedProfile(
+        user_data_dir);
+  }
 #endif
   if (profile)
     return profile;
 
 #if defined(OS_WIN)
 #if defined(USE_AURA)
   // TODO(beng):
   NOTIMPLEMENTED();
 #else
   // Ideally, we should be able to run w/o access to disk.  For now, we
@@ skipping 1316 matching lines @@
     if (base::win::GetVersion() <= base::win::VERSION_XP)
       uma_name += "_XP";
 
     uma_name += "_PreRead_";
     uma_name += pre_read_percentage;
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }