Reset margin input controls error state when error is cleared.

chrome/test/data/webui/print_preview.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.
 
 /**
  * Test fixture for print preview WebUI testing.
  * @constructor
  * @extends {testing.Test}
  */
 function PrintPreviewWebUITest() {
@@ skipping 392 matching lines @@
       this.nativeLayer_, print_preview.NativeLayer.EventType.DISABLE_SCALING);
 
   checkElementDisplayed(
       $('other-options-settings').querySelector('.fit-to-page-container'),
       true);
   expectFalse(
       $('other-options-settings').querySelector('.fit-to-page-checkbox').
           checked);
 });
 
+// Make sure that custom margins controls are properly set up.
+TEST_F('PrintPreviewWebUITest', 'CustomMarginsControlsCheck', function() {
+  var initialSettingsSetEvent =
+      new Event(print_preview.NativeLayer.EventType.INITIAL_SETTINGS_SET);
+  initialSettingsSetEvent.initialSettings = this.initialSettings_;
+  this.nativeLayer_.dispatchEvent(initialSettingsSetEvent);
+
+  var localDestsSetEvent =
+      new Event(print_preview.NativeLayer.EventType.LOCAL_DESTINATIONS_SET);
+  localDestsSetEvent.destinationInfos = this.localDestinationInfos_;
+  this.nativeLayer_.dispatchEvent(localDestsSetEvent);
+
+  var capsSetEvent =
+      new Event(print_preview.NativeLayer.EventType.CAPABILITIES_SET);
+  capsSetEvent.settingsInfo = {
+    'printerId': 'FooDevice',
+    'disableColorOption': false,
+    'setColorAsDefault': true,
+    'disableCopiesOption': true,
+    'disableLandscapeOption': true,
+    'printerDefaultDuplexValue': 0
+  };
+  this.nativeLayer_.dispatchEvent(capsSetEvent);
+
+  printPreview.printTicketStore_.marginsType.updateValue(
+      print_preview.ticket_items.MarginsType.Value.CUSTOM);
+
+  ['left', 'top', 'right', 'bottom'].forEach(function(margin) {
+    var control = $('preview-area').querySelector('.margin-control-' + margin);
+    assertNotEquals(null, control);
+    var input = control.querySelector('.margin-control-textbox');
+    assertTrue(input.hasAttribute('aria-label'));
+    assertNotEquals('undefined', input.getAttribute('aria-label'));
+  });
+});
+
 // Page layout has zero margins. Hide header and footer option.
 TEST_F('PrintPreviewWebUITest',
        'PageLayoutHasNoMarginsHideHeaderFooter',
        function() {
   var initialSettingsSetEvent =
       new Event(print_preview.NativeLayer.EventType.INITIAL_SETTINGS_SET);
   initialSettingsSetEvent.initialSettings = this.initialSettings_;
   this.nativeLayer_.dispatchEvent(initialSettingsSetEvent);
 
   var localDestsSetEvent =
@@ skipping 346 matching lines @@
   expectEquals(true, previewFailedMessageEl.hidden);
 
   var printFailedMessageEl =
       previewAreaEl.getElementsByClassName('preview-area-print-failed')[0];
   expectEquals(true, printFailedMessageEl.hidden);
 
   var customMessageEl =
       previewAreaEl.getElementsByClassName('preview-area-custom-message')[0];
   expectEquals(false, customMessageEl.hidden);
 });