Introduce LaunchParams struct for opening chrome apps.

chrome/browser/automation/testing_automation_provider.cc

Index: chrome/browser/automation/testing_automation_provider.cc
diff --git a/chrome/browser/automation/testing_automation_provider.cc b/chrome/browser/automation/testing_automation_provider.cc
index 57a3d73912654058e77fc27074a2d1be707ab893..038540068dcf97a74f982424d21dcbc35cd7fbb1 100644
--- a/chrome/browser/automation/testing_automation_provider.cc
+++ b/chrome/browser/automation/testing_automation_provider.cc
@@ -5729,8 +5729,8 @@ void TestingAutomationProvider::LaunchApp(
   // This observer will delete itself.
   new AppLaunchObserver(&old_contents->GetController(), this, reply_message,
                         launch_container);
-  application_launch::OpenApplication(profile(), extension, launch_container,
-                                      GURL(), CURRENT_TAB, NULL);
+  application_launch::OpenApplication(application_launch::LaunchParams(
+          profile(), extension, launch_container, CURRENT_TAB));
 }
 
 // Sample JSON input: { "command": "SetAppLaunchType",