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 0f4feaff7ebbf7115314c12748d56d57cf9a24c9..568d69629470c5f040e2ceb7df18b8e2e518e2fc 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2240,4 +2240,10 @@ 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