[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() {
+  if (base.isAppsV2()) {
+    remoting.identity = new remoting.Identity(consentRequired_);
+  } else {
+    remoting.oauth2 = new remoting.OAuth2();
+    if (!remoting.oauth2.isAuthenticated()) {
+      document.getElementById('auth-dialog').hidden = false;
+    }
+    remoting.identity = remoting.oauth2;
+  }
+
+  /** @param {remoting.Error} error */
+  var onGetEmailError = 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);
+    }
+  }
+  remoting.identity.getEmail(remoting.onEmail, onGetEmailError);
+}
+
+/**
+ * Display the user's email address and allow access to the rest of the app,
+ * including parsing URL parameters.
+ *
+ * @param {string} email The user's email address.
+ * @return {void} Nothing.
+ */
+remoting.onEmail = function(email) {
+  document.getElementById('current-email').innerText = email;
+  document.getElementById('get-started-it2me').disabled = false;
+  document.getElementById('get-started-me2me').disabled = false;
+};
+
+/**
+ * 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 consentRequired_(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);
+}