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

chrome/browser/ui/webui/options/manage_profile_handler.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_WEBUI_OPTIONS_MANAGE_PROFILE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGE_PROFILE_HANDLER_H_
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 56 matching lines @@
   //   /*string*/ profileFilePath,
   //   /*string*/ newProfileName,
   //   /*string*/ newProfileIconURL
   // ]
   void SetProfileNameAndIcon(const base::ListValue* args);
 
   // Callback for the "deleteProfile" message. Deletes the given profile.
   // |args| is of the form: [ {string} profileFilePath ]
   void DeleteProfile(const base::ListValue* args);
 
+#if defined(ENABLE_SETTINGS_APP)
+  // Callback for the "profilesAppListSwitch" message. Asks the
+  // app_list_controller to change the profile registered for the AppList.
+  // |args| is of the form: [ {string} profileFilePath ]
+  void ProfilesAppListSwitch(const base::ListValue* args);

[Evan Stade, 2013/01/23 22:18:33]

can you make this function and message name more similar to  an English sentence
in terms of word order?

[koz (OOO until 15th September), 2013/01/25 00:32:46]

I've changed it to SwitchAppListProfile().

+#endif
+
   // Callback for the 'profileIconSelectionChanged' message. Used to update the
   // name in the manager profile dialog based on the selected icon.
   void ProfileIconSelectionChanged(const base::ListValue* args);
 
   // Callback for the "requestHasProfileShortcuts" message, which is called
   // when editing an existing profile. Asks the profile shortcut manager whether
   // the profile has shortcuts and gets the result in |OnHasProfileShortcuts()|.
   // |args| is of the form: [ {string} profileFilePath ]
   void RequestHasProfileShortcuts(const base::ListValue* args);
 
   // Callback invoked from the profile manager indicating whether the profile
   // being edited has any desktop shortcuts.
   void OnHasProfileShortcuts(bool has_shortcuts);
 
   // URL for the current profile's GAIA picture.
   std::string gaia_picture_url_;
 
   // For generating weak pointers to itself for callbacks.
   base::WeakPtrFactory<ManageProfileHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ManageProfileHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGE_PROFILE_HANDLER_H_