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

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index d1b73aeecb63a293572728627c1d5b6b6718b4ee..6dadfb4ef418ff608e2a6063f396d0026d9a8cc2 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2230,4 +2230,10 @@ const char kRLZBrand[] = "rlz.brand";
 const char kRLZDisabled[] = "rlz.disabled";
 #endif
 
+#if defined(ENABLE_APP_LIST)
+// The directory in user data dir that contains the profile to be used with the
+// app launcher.
+extern const char kAppListProfile[] = "app_list.profile";
+#endif
+
 }  // namespace prefs