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

chrome/browser/profiles/profile_manager.cc

Index: chrome/browser/profiles/profile_manager.cc
diff --git a/chrome/browser/profiles/profile_manager.cc b/chrome/browser/profiles/profile_manager.cc
index 714c2883aa4fb51c8e8260838dcdd9d41b9d6c9c..dd14c87d11c477445996493e6930b0728c6751dc 100644
--- a/chrome/browser/profiles/profile_manager.cc
+++ b/chrome/browser/profiles/profile_manager.cc
@@ -310,17 +310,21 @@ Profile* ProfileManager::GetLastUsedProfile(const FilePath& user_data_dir) {
     return GetDefaultProfile(user_data_dir);
 #endif
 
+  return GetProfile(GetLastUsedProfilePath(user_data_dir));
+}
+
+FilePath ProfileManager::GetLastUsedProfilePath(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(
@@ -840,6 +844,7 @@ void ProfileManager::CreateMultiProfileAsync(
 
 // static
 void ProfileManager::RegisterPrefs(PrefServiceSimple* prefs) {
+  prefs->RegisterStringPref(prefs::kAppListProfile, "");
   prefs->RegisterStringPref(prefs::kProfileLastUsed, "");
   prefs->RegisterIntegerPref(prefs::kProfilesNumCreated, 1);
   prefs->RegisterListPref(prefs::kProfilesLastActive);
@@ -1075,6 +1080,7 @@ ProfileManager::ProfileInfo::ProfileInfo(
       created(created) {
 }
 
+
 ProfileManager::ProfileInfo::~ProfileInfo() {
   ProfileDestroyer::DestroyProfileWhenAppropriate(profile.release());
 }