Improve apps v2 upgrade UX

remoting/webapp/crd/js/apps_v2_migration.js

Index: remoting/webapp/crd/js/apps_v2_migration.js
diff --git a/remoting/webapp/crd/js/apps_v2_migration.js b/remoting/webapp/crd/js/apps_v2_migration.js
new file mode 100644
index 0000000000000000000000000000000000000000..61c174ed8f11e0a86e6710715c8273f31731a6b9
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+++ b/remoting/webapp/crd/js/apps_v2_migration.js
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+// 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.
+
+/**
+* @fileoverview
+* The current v1 web-app allows users to sign in as any user. Some users may
+* be signed in using a different account than their chrome profile.  When these
+* users upgrade to the v2 app, their host list will be empty and it is not
+* obvious why.  remoting.AppsV2Migration shows a migration tip to the user to
+* sign in to their previous accounts if necessary.
+*/
+
+'use strict';
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+(function() {
+
+// Storage key used for the migration settings.
+var MIGRATION_KEY_ = 'remoting-v2-migration';
+
+/**
+ * @constructor
+ * @param {string} email
+ * @param {string} fullName
+ */
+remoting.MigrationSettings = function(email, fullName) {
+  this.email = email;
+  this.fullName = fullName;
+};
+
+remoting.AppsV2Migration = function() {};
+
+/**
+ * @return {Promise} A Promise object that would resolve to
+ *   {remoting.MigrationSettings} if the user has previously signed-in to
+ *   the v1 app with a different account that has hosts registered to it.
+ *   Otherwise, the promise will be rejected.
+ */
+remoting.AppsV2Migration.hasHostsInV1App = function() {
+  if (!base.isAppsV2()) {
+    return Promise.reject(false);
+  }
+
+  var getV1UserInfo = base.Promise.as(chrome.storage.local.get,
+                                       [MIGRATION_KEY_],
+                                       chrome.storage.local);
+  var getEmail = base.Promise.as(remoting.identity.getUserInfo, [],
+                                 remoting.identity, true);
+
+  return Promise.all([getV1UserInfo, getEmail]).then(
+    /** @param {Object} results */
+    function(results){
+      var v1User =
+          /**@type {remoting.MigrationSettings} */ (results[0][MIGRATION_KEY_]);
+      var currentEmail = /** @type {string}*/ (results[1]);
+
+      if (v1User && v1User.email && v1User.email !== currentEmail) {
+        return Promise.resolve(v1User);
+      }
+      return Promise.reject(false);
+    }
+  );
+};
+
+/**
+ * @param {string} email
+ * @param {string} fullName
+ * @return {string}
+ */
+remoting.AppsV2Migration.buildMigrationTips = function(email, fullName) {
+  var params = [
+      fullName,
+      email,
+      '<a href="https://support.google.com/chrome/answer/2364824?hl=en" ' +
+         'target="_blank">',
+      '</a>'];
+  return l10n.getTranslationOrError(
+      /*i18n-content*/'HOST_LIST_EMPTY_V2_MIGRATION', params);
+};
+
+/**
+ * Saves the email and full name of the current user as the migration settings
+ * in the v1 app.  Clears the migration settings in the v2 app.
+ */
+remoting.AppsV2Migration.saveUserInfo = function() {
+  if (base.isAppsV2()) {
+    chrome.storage.local.remove(MIGRATION_KEY_);
+  } else {
+    /**
+     * @param {string} email
+     * @param {string} fullName
+     */
+    remoting.identity.getUserInfo(function(email, fullName) {
+      var preference = {};
+      preference[MIGRATION_KEY_] =
+        new remoting.MigrationSettings(email, fullName);
+      chrome.storage.local.set(preference);
+    }, base.doNothing);
+  }
+};
+
+}());
+