[Payments] Add combobox support to editors.

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 4820 matching lines @@
         "../browser/ui/views/extensions/chooser_dialog_view_unittest.cc",
         "../browser/ui/views/extensions/media_galleries_dialog_views_unittest.cc",
         "../browser/ui/views/frame/browser_non_client_frame_view_unittest.cc",
         "../browser/ui/views/frame/browser_view_layout_unittest.cc",
         "../browser/ui/views/frame/browser_view_unittest.cc",
         "../browser/ui/views/frame/test_with_browser_view.cc",
         "../browser/ui/views/frame/test_with_browser_view.h",
         "../browser/ui/views/frame/web_contents_close_handler_unittest.cc",
         "../browser/ui/views/location_bar/icon_label_bubble_view_unittest.cc",
         "../browser/ui/views/omnibox/omnibox_view_views_unittest.cc",
+        "../browser/ui/views/payments/credit_card_editor_view_controller_unittest.cc",
         "../browser/ui/views/payments/validating_textfield_unittest.cc",
         "../browser/ui/views/payments/view_stack_unittest.cc",
         "../browser/ui/views/status_icons/status_tray_win_unittest.cc",
         "../browser/ui/views/sync/bubble_sync_promo_view_unittest.cc",
         "../browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views_unittest.cc",
         "../browser/ui/views/tabs/alert_indicator_button_unittest.cc",
         "../browser/ui/views/tabs/fake_base_tab_strip_controller.cc",
         "../browser/ui/views/tabs/fake_base_tab_strip_controller.h",
         "../browser/ui/views/tabs/stacked_tab_strip_layout_unittest.cc",
         "../browser/ui/views/tabs/tab_strip_layout_unittest.cc",
@@ skipping 328 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }