[Chromoting] Break up the webapp's init function into smaller chunks.

remoting/webapp/base/js/auth_init.js

+// Copyright 2014 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.
+
+'use strict';
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+remoting.initIdentity = function() {
+
+  /**
+   * Show the authorization consent UI and register a one-shot event handler to
+   * continue the authorization process.
+   *
+   * @param {function():void} authContinue Callback to invoke when the user
+   *     clicks "Continue".
+   */
+  function promptForConsent(authContinue) {
+    /** @type {HTMLElement} */
+    var dialog = document.getElementById('auth-dialog');
+    /** @type {HTMLElement} */
+    var button = document.getElementById('auth-button');
+    var consentGranted = function(event) {
+      dialog.hidden = true;
+      button.removeEventListener('click', consentGranted, false);
+      authContinue();
+      remoting.windowShape.updateClientWindowShape();
+    };
+    dialog.hidden = false;
+
+    /** @type {HTMLElement} */
+    var dialog_border = document.getElementById('auth-dialog-border');
+    remoting.authDialog = new remoting.AuthDialog(dialog_border);
+    remoting.windowShape.addCallback(remoting.authDialog);
+
+    button.addEventListener('click', consentGranted, false);
+  }
+
+  if (base.isAppsV2()) {
+    remoting.identity = new remoting.Identity(promptForConsent);
+  } else {
+    // TODO(garykac) Remove this and replace with identity.
+    remoting.oauth2 = new remoting.OAuth2();
+    if (!remoting.oauth2.isAuthenticated()) {
+      document.getElementById('auth-dialog').hidden = false;
+    }
+    remoting.identity = remoting.oauth2;
+  }
+}
+
+/** @param {remoting.Error} error */
+remoting.onGetIdentityInfoError = function(error) {
+  // No need to show the error message for NOT_AUTHENTICATED
+  // because we will show "auth-dialog".
+  if (error != remoting.Error.NOT_AUTHENTICATED) {
+    remoting.showErrorMessage(error);
+  }
+}
+
+/**
+ * @param {function(string):void} onEmailAvailable Callback invoked when the
+ *     email address is available.
+ * @return {void} Nothing.
+ */
+remoting.initIdentityEmail = function(onEmailAvailable) {
+  remoting.identity.getEmail(onEmailAvailable,
+                             remoting.onGetIdentityInfoError);
+}
+
+/**
+ * Get the user's email address and full name.
+ *
+ * @param {function(string,string):void} onUserInfoAvailable Callback invoked
+ *     when the user's email address and full name are available.
+ * @return {void} Nothing.
+ */
+remoting.initIdentityUserInfo = function(onUserInfoAvailable) {
+  remoting.identity.getUserInfo(onUserInfoAvailable,
+                                remoting.onGetIdentityInfoError);
+}