Introduce LaunchParams struct for opening chrome apps.

chrome/browser/ui/views/ash/launcher/chrome_launcher_controller_browsertest.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/ui/views/ash/launcher/chrome_launcher_controller.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
@@ skipping 48 matching lines @@
       const char* name,
       extension_misc::LaunchContainer container,
       WindowOpenDisposition disposition) {
     EXPECT_TRUE(LoadExtension(test_data_dir_.AppendASCII(name)));
 
     ExtensionService* service = browser()->profile()->GetExtensionService();
     const Extension* extension =
         service->GetExtensionById(last_loaded_extension_id_, false);
     EXPECT_TRUE(extension);
 
-    application_launch::OpenApplication(
-        browser()->profile(),
-        extension,
-        // Overriding manifest to open in a panel.
-        container,
-        GURL(),
-        disposition,
-        NULL);
+    application_launch::OpenApplication(application_launch::LaunchParams(
+            browser()->profile(), extension, container, disposition));
     return extension;
   }
 
   ash::LauncherID CreateShortcut(const char* name) {
     ExtensionService* service = browser()->profile()->GetExtensionService();
     LoadExtension(test_data_dir_.AppendASCII(name));
 
     // First get app_id.
     const Extension* extension =
         service->GetExtensionById(last_loaded_extension_id_, false);
@@ skipping 502 matching lines @@
   // Navigate away.
   ui_test_utils::NavigateToURL(
       browser(), GURL("http://www.example.com/path0/bar.html"));
   EXPECT_EQ(ash::STATUS_CLOSED, (*model_->ItemByID(shortcut_id)).status);
 
   // Navigate back.
   ui_test_utils::NavigateToURL(
       browser(), GURL("http://www.example.com/path1/foo.html"));
   EXPECT_EQ(ash::STATUS_ACTIVE, (*model_->ItemByID(shortcut_id)).status);
 }