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

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_api.cc',
       'browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_api.h',
       'browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc',
@@ skipping 354 matching lines @@
       'browser/extensions/api/networking_private/networking_private_verify_delegate_factory_impl.cc',
       'browser/extensions/api/networking_private/networking_private_verify_delegate_factory_impl.h',
       'browser/extensions/api/notification_provider/notification_provider_api.cc',
       'browser/extensions/api/notification_provider/notification_provider_api.h',
       'browser/extensions/api/notifications/notifications_api.cc',
       'browser/extensions/api/notifications/notifications_api.h',
       'browser/extensions/api/omnibox/omnibox_api.cc',
       'browser/extensions/api/omnibox/omnibox_api.h',
       'browser/extensions/api/page_capture/page_capture_api.cc',
       'browser/extensions/api/page_capture/page_capture_api.h',
+      'browser/extensions/api/passwords_private/passwords_private_api.cc',
+      'browser/extensions/api/passwords_private/passwords_private_api.h',
       'browser/extensions/api/permissions/permissions_api.cc',
       'browser/extensions/api/permissions/permissions_api.h',
       'browser/extensions/api/permissions/permissions_api_helpers.cc',
       'browser/extensions/api/permissions/permissions_api_helpers.h',
       'browser/extensions/api/preference/chrome_direct_setting.cc',
       'browser/extensions/api/preference/chrome_direct_setting.h',
       'browser/extensions/api/preference/chrome_direct_setting_api.cc',
       'browser/extensions/api/preference/chrome_direct_setting_api.h',
       'browser/extensions/api/preference/preference_api.cc',
       'browser/extensions/api/preference/preference_api.h',
@@ skipping 698 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }