Add a regression test for the CardUnmaskPrompt.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 41b3de2e452a3612474764cfed84b02dada5763e..10a0e85b0437f5091aa93102294854dac20a34b3 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -429,6 +429,8 @@
       'browser/ui/ash/volume_controller_browsertest_chromeos.cc',
       'browser/ui/autofill/autofill_dialog_controller_browsertest.cc',
       'browser/ui/autofill/autofill_dialog_view_tester.h',
+      'browser/ui/autofill/card_unmask_prompt_view_browsertest.cc',
+      'browser/ui/autofill/card_unmask_view_tester.h',
       'browser/ui/autofill/mock_address_validator.cc',
       'browser/ui/autofill/mock_address_validator.h',
       'browser/ui/autofill/password_generation_popup_view_browsertest.cc',
@@ -596,6 +598,8 @@
       'browser/ui/views/autofill/autofill_dialog_view_tester_views.cc',
       'browser/ui/views/autofill/autofill_dialog_view_tester_views.h',
       'browser/ui/views/autofill/autofill_popup_base_view_browsertest.cc',
+      'browser/ui/views/autofill/card_unmask_prompt_view_tester_views.cc',
+      'browser/ui/views/autofill/card_unmask_prompt_view_tester_views.h',
       'browser/ui/views/autofill/password_generation_popup_view_tester_views.cc',
       'browser/ui/views/autofill/password_generation_popup_view_tester_views.h',
       'browser/ui/views/collected_cookies_views_browsertest.cc',
@@ -2270,8 +2274,6 @@
             'browser/media_galleries/fileapi/iphoto_data_provider_browsertest.cc',
             'browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper_browsertest.mm',
             'browser/spellchecker/spellcheck_message_filter_mac_browsertest.cc',
-            # TODO(bondd): Make this test work on other platforms.
-            'browser/ui/autofill/card_unmask_prompt_view_browsertest.cc',
           ],
           'sources!': [
             # TODO(groby): This test depends on hunspell and we cannot run it on