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

chrome/browser/profiles/profile_manager.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 <set>
 
 #include "chrome/browser/profiles/profile_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 292 matching lines @@
   return relative_profile_dir;
 }
 
 Profile* ProfileManager::GetLastUsedProfile(const FilePath& user_data_dir) {
 #if defined(OS_CHROMEOS)
   // Use default login profile if user has not logged in yet.
   if (!logged_in_)
     return GetDefaultProfile(user_data_dir);
 #endif
 
+  return GetProfile(GetLastUsedProfileDir(user_data_dir));
+}
+
+FilePath ProfileManager::GetLastUsedProfileDir(const FilePath& user_data_dir) {
   FilePath last_used_profile_dir(user_data_dir);
-  std::string last_profile_used;
+  std::string last_used_profile;
   PrefService* local_state = g_browser_process->local_state();
   DCHECK(local_state);
 
-  if (local_state->HasPrefPath(prefs::kProfileLastUsed))
-    last_profile_used = local_state->GetString(prefs::kProfileLastUsed);
-  last_used_profile_dir = last_profile_used.empty() ?
-      last_used_profile_dir.AppendASCII(chrome::kInitialProfile) :
-      last_used_profile_dir.AppendASCII(last_profile_used);
-  return GetProfile(last_used_profile_dir);
+  if (local_state->HasPrefPath(prefs::kProfileLastUsed)) {
+    return last_used_profile_dir.AppendASCII(
+        local_state->GetString(prefs::kProfileLastUsed));
+  }
+
+  return last_used_profile_dir.AppendASCII(chrome::kInitialProfile);
 }
 
 std::vector<Profile*> ProfileManager::GetLastOpenedProfiles(
     const FilePath& user_data_dir) {
   PrefService* local_state = g_browser_process->local_state();
   DCHECK(local_state);
 
   std::vector<Profile*> to_return;
   if (local_state->HasPrefPath(prefs::kProfilesLastActive)) {
     const ListValue* profile_list =
@@ skipping 737 matching lines @@
 ProfileManager::ProfileInfo::ProfileInfo(
     Profile* profile,
     bool created)
     : profile(profile),
       created(created) {
 }
 
 ProfileManager::ProfileInfo::~ProfileInfo() {
   ProfileDestroyer::DestroyProfileWhenAppropriate(profile.release());
 }