Refactor kiosk app launch to be part of login screen UI flow.

chrome/browser/resources/chromeos/login/screen_app_launch_splash.js

+// Copyright (c) 2013 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.
+
+/**
+ * @fileoverview App install/launch splash screen implementation.
+ */
+
+login.createScreen('AppLaunchSplashScreen', 'app-launch-splash', function() {
+  return {
+    EXTERNAL_API: [
+      'toggleNetworkConfig',
+      'updateApp',
+      'updateMessage',
+    ],
+
+    /**
+     * Event handler that is invoked just before the frame is shown.
+     * @param {string} data Screen init payload.
+     */
+    onBeforeShow: function(data) {
+      disableTextSelectAndDrag();

[xiyuan, 2013/08/15 18:19:42]

Don't think we need this. Select and drag should be disabled on login screen
except on input fields.

[Tim Song, 2013/08/16 19:07:59]

Done. This is indeed the case.

+
+      this.updateApp(data['appInfo']);
+
+      var shortcutEnabled = data['shortcutEnabled'];
+      $('splash-shortcut-info').hidden =
+          shortcutEnabled != null ? !shortcutEnabled : true;

[xiyuan, 2013/08/15 18:19:42]

How could |shortcutEnabled| be null?

[Tim Song, 2013/08/16 19:07:59]

Done. We'll always pass in this field when we show the screen.

+      window.webkitRequestAnimationFrame(function() {});

[xiyuan, 2013/08/15 18:19:42]

This seems not needed.

[Tim Song, 2013/08/16 19:07:59]

Done.

+
+      Oobe.getInstance().headerHidden = true;
+    },
+
+    /**
+     * Event handler that is invoked just before the frame is hidden.
+     */
+    onBeforeHide: function() {
+      // Re-enable text select and drag.
+      disableTextSelectAndDrag(true, true);

[xiyuan, 2013/08/15 18:19:42]

Why do we need to do it here?

[Tim Song, 2013/08/16 19:07:59]

Done.

+    },
+
+    /**
+     * Toggles visibility of the network configuration option.
+     * @param {boolean} visible Whether to show the option.
+     */
+    toggleNetworkConfig: function(visible) {
+      // TODO(tengs): Implement network configuration in app launch.
+    },
+
+    /**
+     * Updates the app name and icon.
+     * @param {Object} app Details of app being launched.
+     */
+    updateApp: function(app) {
+      $('splash-header').textContent = app.name;
+      $('splash-header').style.backgroundImage = 'url(' + app.iconURL + ')';
+    },
+
+    /**
+     * Updates the message for the current launch state.
+     * @param {string} message Description for current launch state.
+     */
+    updateMessage: function(message) {
+      $('splash-launch-text').textContent = message;
+    },

[xiyuan, 2013/08/15 18:19:42]

nit: no ',' for the last property.

[Tim Song, 2013/08/16 19:07:59]

Done.

+  };
+});