Introduce LaunchParams struct for opening chrome apps.

chrome/browser/background/background_mode_manager.cc

Index: chrome/browser/background/background_mode_manager.cc
diff --git a/chrome/browser/background/background_mode_manager.cc b/chrome/browser/background/background_mode_manager.cc
index e0a4b49704debcfbc0f5b859087b70a51af858dc..6411635eeda246ca7b95db8828e6e4947e9b1137 100644
--- a/chrome/browser/background/background_mode_manager.cc
+++ b/chrome/browser/background/background_mode_manager.cc
@@ -264,8 +264,8 @@ void BackgroundModeManager::LaunchBackgroundApplication(
   extension_misc::LaunchContainer launch_container =
       service->extension_prefs()->GetLaunchContainer(
           extension, extensions::ExtensionPrefs::LAUNCH_REGULAR);
-  application_launch::OpenApplication(profile, extension, launch_container,
-                                      GURL(), NEW_FOREGROUND_TAB, NULL);
+  application_launch::OpenApplication(application_launch::LaunchParams(
+          profile, extension, launch_container, NEW_FOREGROUND_TAB));
 }
 
 bool BackgroundModeManager::IsBackgroundModeActiveForTest() {