Add RealPanWalletClient for handling card unmasking requests.

components/autofill/core/browser/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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   autofill_enable_sync = !is_android_webview_build
 } else {
   autofill_enable_sync = true
 }
@@ skipping 101 matching lines @@
     "phone_number.h",
     "phone_number_i18n.cc",
     "phone_number_i18n.h",
     "popup_item_ids.h",
     "state_names.cc",
     "state_names.h",
     "suggestion.cc",
     "suggestion.h",
     "validation.cc",
     "validation.h",
+    "wallet/real_pan_wallet_client.cc",
+    "wallet/real_pan_wallet_client.h",
     "webdata/autocomplete_syncable_service.cc",
     "webdata/autocomplete_syncable_service.h",
     "webdata/autofill_change.cc",
     "webdata/autofill_change.h",
     "webdata/autofill_entry.cc",
     "webdata/autofill_entry.h",
     "webdata/autofill_profile_syncable_service.cc",
     "webdata/autofill_profile_syncable_service.h",
     "webdata/autofill_table.cc",
     "webdata/autofill_table.h",
@@ skipping 141 matching lines @@
     "//sync",
     "//sync:test_support_sync_api",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libphonenumber",
     "//third_party/libjingle",
     "//ui/base",
     "//url",
   ]
 }