Revert of [Chromoting] Show any startup errors in the LoadingWindow.

remoting/webapp/base/js/message_window.js

Index: remoting/webapp/base/js/message_window.js
diff --git a/remoting/webapp/base/js/message_window.js b/remoting/webapp/base/js/message_window.js
index c25f6e367d89d5f13bfe91760465d8d0ef47ff5b..f2c36347eb9ffb6128916a5189d4fe056d515ab2 100644
--- a/remoting/webapp/base/js/message_window.js
+++ b/remoting/webapp/base/js/message_window.js
@@ -44,16 +44,19 @@
 };
 
 /**
- * Updates the button label text.
+ * Initializes the button with the label and the click handler.
  * Hides the button if the label is null or undefined.
  *
  * @param{HTMLElement} button
  * @param{?string} label
+ * @param{Function} clickHandler
  * @private
  */
-MessageWindowImpl.prototype.updateButton_ = function(button, label) {
+MessageWindowImpl.prototype.initButton_ =
+    function(button, label, clickHandler) {
   if (label) {
     button.innerText = label;
+    button.addEventListener('click', clickHandler, false);
   }
   button.hidden = !Boolean(label);
 };
@@ -66,89 +69,86 @@
  * @private
  */
 MessageWindowImpl.prototype.onMessage_ = function(event) {
-  var command = /** @type {string} */ (event.data['command']);
-  if (command !== 'show' && command !== 'update') {
-    console.error('Unexpected message: ' + command);
-    return;
-  }
+  switch (event.data['command']) {
+    case 'show':
+      // Validate the message.
+      var messageId = /** @type {number} */ (event.data['id']);
+      var title = /** @type {string} */ (event.data['title']);
+      var message = /** @type {string} */ (event.data['message']);
+      var infobox = /** @type {string} */ (event.data['infobox']);
+      var buttonLabel = /** @type {string} */ (event.data['buttonLabel']);
+      /** @type {string} */
+      var cancelButtonLabel = (event.data['cancelButtonLabel']);
+      var showSpinner = /** @type {boolean} */ (event.data['showSpinner']);
+      if (typeof(messageId) != 'number' ||
+          typeof(title) != 'string' ||
+          typeof(message) != 'string' ||
+          typeof(infobox) != 'string' ||
+          typeof(buttonLabel) != 'string' ||
+          typeof(showSpinner) != 'boolean') {
+        console.log('Bad show message:', event.data);
+        break;
+      }
 
-  // Validate the message.
-  var messageId = /** @type {number} */ (event.data['id']);
-  var title = /** @type {string} */ (event.data['title']);
-  var message = /** @type {string} */ (event.data['message']);
-  var infobox = /** @type {string} */ (event.data['infobox']);
-  var buttonLabel = /** @type {string} */ (event.data['buttonLabel']);
-  var cancelButtonLabel = /** @type {string} */
-      (event.data['cancelButtonLabel']);
-  var showSpinner = /** @type {boolean} */ (event.data['showSpinner']);
+      // Set the dialog text.
+      var button = document.getElementById('button-primary');
+      var cancelButton = document.getElementById('button-secondary');
+      var messageDiv = document.getElementById('message');
+      var infoboxDiv = document.getElementById('infobox');
 
-  // Many of these fields are optional for either the 'show' or 'update'
-  // message. These vars are used to mark the optional fields to allow
-  // them to be undefined.
-  var optionalFieldShow = command === 'show';
-  var optionalFieldUpdate = command === 'update';
-  if (isNumber(messageId) ||
-      isString(title, optionalFieldUpdate) ||
-      isString(message, optionalFieldUpdate) ||
-      isString(infobox, optionalFieldUpdate) ||
-      isString(buttonLabel, optionalFieldUpdate) ||
-      isString(cancelButtonLabel, optionalFieldShow || optionalFieldUpdate) ||
-      isBoolean(showSpinner, optionalFieldUpdate) {
-    console.log('Bad ' + command + ' message: ' + event.data);
-    return;
-  }
+      document.getElementById('title').innerText = title;
+      document.querySelector('title').innerText = title;
+      messageDiv.innerHTML = message;
 
-  var button = document.getElementById('button-primary');
-  var cancelButton = document.getElementById('button-secondary');
-  var messageDiv = document.getElementById('message');
-  var infoboxDiv = document.getElementById('infobox');
+      if (showSpinner) {
+        messageDiv.classList.add('waiting');
+        messageDiv.classList.add('prominent');
+      }
+      if (infobox != '') {
+        infoboxDiv.innerText = infobox;
+      } else {
+        infoboxDiv.hidden = true;
+      }
 
-  if (isString(title)) {
-    document.getElementById('title').innerText = title;
-    document.querySelector('title').innerText = title;
-  }
-  if (isString(message) {
-    messageDiv.innerText = message;
-  }
-  if (isString(infobox)) {
-    if (infobox != '') {
-      infoboxDiv.innerText = infobox;
-    } else {
-      infoboxDiv.hidden = true;
-    }
-  }
-  if (isBoolean(showSpinner)) {
-    if (showSpinner) {
-      messageDiv.classList.add('waiting');
-      messageDiv.classList.add('prominent');
-    } else {
-      messageDiv.classList.remove('waiting');
-      messageDiv.classList.remove('prominent');
-    }
-  }
-  this.updateButton_(button, buttonLabel);
-  this.updateButton_(cancelButton, cancelButtonLabel);
+      this.initButton_(
+          button,
+          buttonLabel,
+          this.sendReply_.bind(this, event.source, messageId, 1));
 
-  base.resizeWindowToContent(true);
+      this.initButton_(
+          cancelButton,
+          cancelButtonLabel,
+          this.sendReply_.bind(this, event.source, messageId, 0));
 
-  if (command === 'show') {
-    // Set up click-handlers for the buttons.
-    button.addEventListener(
-        'click', this.sendReply_.bind(this, event.source, messageId, 1), false);
-    cancelButton.addEventListener(
-        'click', this.sendReply_.bind(this, event.source, messageId, 0), false);
+      var buttonToFocus = (cancelButtonLabel) ? cancelButton : button;
+      buttonToFocus.focus();
 
-    var buttonToFocus = (cancelButtonLabel) ? cancelButton : button;
-    buttonToFocus.focus();
+      // Add a close handler in case the window is closed without clicking one
+      // of the buttons. This will send a 0 as the result.
+      // Note that when a button is pressed, this will result in sendReply_
+      // being called multiple times (once for the button, once for close).
+      chrome.app.window.current().onClosed.addListener(
+          this.sendReply_.bind(this, event.source, messageId, 0));
 
-    // Add a close handler in case the window is closed without clicking one
-    // of the buttons. This will send a 0 as the result.
-    // Note that when a button is pressed, this will result in sendReply_
-    // being called multiple times (once for the button, once for close).
-    chrome.app.window.current().onClosed.addListener(
-        this.sendReply_.bind(this, event.source, messageId, 0));
+      base.resizeWindowToContent(true);
+      chrome.app.window.current().show();
+      break;
 
-    chrome.app.window.current().show();
+    case 'update_message':
+      var message = /** @type {string} */ (event.data['message']);
+      if (typeof(message) != 'string') {
+        console.log('Bad update_message message:', event.data);
+        break;
+      }
+
+      var messageDiv = document.getElementById('message');
+      messageDiv.innerText = message;
+
+      base.resizeWindowToContent(true);
+      break;
+
+    default:
+      console.error('Unexpected message:', event.data);
   }
 };