cros: Account picker UI for public account.

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

+// 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.
+
+cr.define('login', function() {
+  /**
+   * Creates a new public account sign in screen.

[Nikita (slow), 2012/11/28 18:57:34]

nit: at sign in screen

[bartfab (slow), 2012/11/29 14:32:28]

How does this class "create a new public account at [the] sign in screen"? It
creates a new screen, not a new account at the screen. IMHO, the original
wording is correct here.

[Nikita (slow), 2012/11/29 15:21:47]

Right.

+   * @constructor
+   * @extends {HTMLDivElement}
+   */
+  var PublicAccountSigninScreen = cr.ui.define('div');
+
+  PublicAccountSigninScreen.register = function() {
+    var screen = $('public-account-signin');
+    PublicAccountSigninScreen.decorate(screen);
+    Oobe.getInstance().registerScreen(screen);
+  };
+
+  PublicAccountSigninScreen.prototype = {
+    __proto__: HTMLDivElement.prototype,
+
+    email_: undefined,

[bartfab (slow), 2012/11/28 15:11:38]

Is this needed? If you try to access |this.email_| before it has been set, you
will get |undefined|, even if you do not specify that explicitly.

[Ivan Korotkov, 2012/11/28 21:50:39]

This is what roughly corresponds to a static member in OO languages (i.e., all
PublicAccountSigninScreen instances will share a common this.email_). Is that
really what you meant?

[bartfab (slow), 2012/11/29 14:32:28]

Well, it's only a static default. If you set this.email_ = "blah" on a specific
object (as Xiyuan does in line 33), that value will stick on the object. So this
line here does not break anything - but it is unnecessary as the default is
|undefined| anyway.

+
+    /** @override */
+    decorate: function() {
+      $('public-account-enter-button').addEventListener('click', (function(e) {
+        if (this.email_)
+          chrome.send('launchPublicAccount', [this.email_]);
+      }).bind(this));
+    },
+
+    onBeforeShow: function(data) {
+      this.email_ = data.email;
+      $('public-account-name').textContent = data.name;
+      $('public-account-avartar').src = data.imageUrl;

[Ivan Korotkov, 2012/11/28 21:50:39]

avatar

+    }
+  };
+
+  return {
+    PublicAccountSigninScreen: PublicAccountSigninScreen
+  };
+});