Make "source" a required argument of AppLaunchParams and fill in the argument in all call points.

chrome/browser/chromeos/extensions/wallpaper_manager_util.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 "chrome/browser/chromeos/extensions/wallpaper_manager_util.h"
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/extensions/app_launch_params.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "extensions/browser/extension_system.h"
+#include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "ui/base/window_open_disposition.h"
 
 namespace wallpaper_manager_util {
 
 void OpenWallpaperManager() {
   Profile* profile = ProfileManager::GetActiveUserProfile();
   DCHECK(profile);
 
   ExtensionService* service =
       extensions::ExtensionSystem::Get(profile)->extension_service();
   if (!service)
     return;
 
   const extensions::Extension* extension =
       service->GetExtensionById(extension_misc::kWallpaperManagerId, false);
   if (!extension)
     return;
 
-  OpenApplication(AppLaunchParams(profile, extension,
-                                  extensions::LAUNCH_CONTAINER_WINDOW,
-                                  NEW_WINDOW));
+  OpenApplication(
+      AppLaunchParams(profile, extension, extensions::LAUNCH_CONTAINER_WINDOW,
+                      NEW_WINDOW, extensions::SOURCE_CHROME_INTERNAL));
 }
 
 }  // namespace wallpaper_manager_util