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

chrome/browser/ui/startup/startup_browser_creator.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_STARTUP_STARTUP_BROWSER_CREATOR_H_
 #define CHROME_BROWSER_UI_STARTUP_STARTUP_BROWSER_CREATOR_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 30 matching lines @@
              const FilePath& cur_dir,
              Profile* last_used_profile,
              const Profiles& last_opened_profiles,
              int* return_code) {
     return ProcessCmdLineImpl(cmd_line, cur_dir, true, last_used_profile,
                               last_opened_profiles, return_code, this);
   }
 
   // This function performs command-line handling and is invoked only after
   // start up (for example when we get a start request for another process).
   // |command_line| holds the command line we need to process

[tapted, 2013/01/21 00:37:02]

nit: while you're here - comment is missing a period. But perhaps add a
description of cur_dir (also: should this be 'user_data_dir'?), and
startup_profile_dir.

[koz (OOO until 15th September), 2013/01/21 23:23:15]

Done.

-  static void ProcessCommandLineAlreadyRunning(const CommandLine& cmd_line,
-                                               const FilePath& cur_dir);
+  static void ProcessCommandLineAlreadyRunning(
+      const CommandLine& cmd_line,

[tapted, 2013/01/21 00:37:02]

nit: while you're here.. 'cmd_line' got abbreviated some time in the past and,
additionally, doesn't match the function comment. Should be command_line.

[koz (OOO until 15th September), 2013/01/21 23:23:15]

Done.

+      const FilePath& cur_dir,
+      const FilePath& startup_profile_dir);
 
   template <class AutomationProviderClass>
   static bool CreateAutomationProvider(const std::string& channel_id,
                                        Profile* profile,
                                        size_t expected_tabs);
 
   // Returns true if we're launching a profile synchronously. In that case, the
   // opened window should not cause a session restore.
   static bool InSynchronousProfileLaunch();
 
@@ skipping 85 matching lines @@
   // member variable instead of a static variable inside WasRestarted because
   // of testing.)
   static bool was_restarted_read_;
 
   static bool in_synchronous_profile_launch_;
 
   DISALLOW_COPY_AND_ASSIGN(StartupBrowserCreator);
 };
 
 #endif  // CHROME_BROWSER_UI_STARTUP_STARTUP_BROWSER_CREATOR_H_