[Payments] Add combobox support to editors.

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 1522 matching lines @@
       "views/payments/payment_request_row_view.cc",
       "views/payments/payment_request_row_view.h",
       "views/payments/payment_request_sheet_controller.cc",
       "views/payments/payment_request_sheet_controller.h",
       "views/payments/payment_request_views_util.cc",
       "views/payments/payment_request_views_util.h",
       "views/payments/payment_sheet_view_controller.cc",
       "views/payments/payment_sheet_view_controller.h",
       "views/payments/shipping_list_view_controller.cc",
       "views/payments/shipping_list_view_controller.h",
+      "views/payments/validating_combobox.cc",
+      "views/payments/validating_combobox.h",
       "views/payments/validating_textfield.cc",
       "views/payments/validating_textfield.h",
+      "views/payments/validation_delegate.h",
       "views/payments/view_stack.cc",
       "views/payments/view_stack.h",
       "views/subtle_notification_view.cc",
       "views/subtle_notification_view.h",
       "views/sync/bubble_sync_promo_view.cc",
       "views/sync/bubble_sync_promo_view.h",
       "views/sync/profile_signin_confirmation_dialog_views.cc",
       "views/sync/profile_signin_confirmation_dialog_views.h",
       "views/task_manager_view.cc",
       "views/task_manager_view.h",
@@ skipping 1960 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }