Add the IDL and stub implementation for the chrome.passwordsPrivate API.

third_party/closure_compiler/externs/autofill_private.js

 // Copyright 2015 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 Externs generated from namespace: autofillPrivate */
 
 /**
  * @const
  */
 chrome.autofillPrivate = {};
@@ skipping 41 matching lines @@
  *   emailAddresses: (!Array<string>|undefined),
  *   languageCode: (string|undefined),
  *   metadata: (AutofillMetadata|undefined)
  * }}
  * @see https://developer.chrome.com/extensions/autofillPrivate#type-AddressEntry
  */
 var AddressEntry;
 
 /**
  * @typedef {{
- *   field: number,
+ *   field: !chrome.autofillPrivate.AddressField,
  *   fieldName: string,
  *   isLongField: boolean,
  *   placeholder: (string|undefined)
  * }}
  * @see https://developer.chrome.com/extensions/autofillPrivate#type-AddressComponent
  */
 var AddressComponent;
 
 /**
  * @typedef {{
@@ skipping 98 matching lines @@
 
 /**
  * Fired when the credit card list has changed, meaning that an entry has been
  * added, removed, or changed.  |entries| The updated list of entries.
  * @type {!ChromeEvent}
  * @see https://developer.chrome.com/extensions/autofillPrivate#event-onCreditCardListChanged
  */
 chrome.autofillPrivate.onCreditCardListChanged;