Add a regression test for the CardUnmaskPrompt.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'variables': {
     # There are two sections of sources:
     # * "Platform"-based sources (OS, toolkit, etc.)
     # * Feature/directory-based sources (e.g., history, printing)
 
@@ skipping 1923 matching lines @@
       'browser/ui/views/ash/tab_scrubber.h',
       'browser/ui/views/auto_keep_alive.cc',
       'browser/ui/views/auto_keep_alive.h',
       'browser/ui/views/autofill/autofill_dialog_views.cc',
       'browser/ui/views/autofill/autofill_dialog_views.h',
       'browser/ui/views/autofill/autofill_popup_base_view.cc',
       'browser/ui/views/autofill/autofill_popup_base_view.h',
       'browser/ui/views/autofill/autofill_popup_view_views.cc',
       'browser/ui/views/autofill/autofill_popup_view_views.h',
       'browser/ui/views/autofill/card_unmask_prompt_views.cc',
+      'browser/ui/views/autofill/card_unmask_prompt_views.h',
       'browser/ui/views/autofill/decorated_textfield.cc',
       'browser/ui/views/autofill/decorated_textfield.h',
       'browser/ui/views/autofill/expanding_textfield.cc',
       'browser/ui/views/autofill/expanding_textfield.h',
       'browser/ui/views/autofill/generated_credit_card_bubble_views.cc',
       'browser/ui/views/autofill/generated_credit_card_bubble_views.h',
       'browser/ui/views/autofill/info_bubble.cc',
       'browser/ui/views/autofill/info_bubble.h',
       'browser/ui/views/autofill/new_credit_card_bubble_views.cc',
       'browser/ui/views/autofill/new_credit_card_bubble_views.h',
@@ skipping 1229 matching lines @@
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }