Add precompiled headers to GN build for large targets.

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.
 
 import("//build/config/chrome_build.gni")
 
 # This config sets the define that controls which Wallet service to contact
 # for features using Wallet integration. Unofficial builds won't have the
 # proper API keys so it uses the "sandbox" test servers instead.
 config("wallet_service") {
@@ skipping 118 matching lines @@
     "webdata/autofill_wallet_syncable_service.h",
     "webdata/autofill_webdata.h",
     "webdata/autofill_webdata_backend.h",
     "webdata/autofill_webdata_backend_impl.cc",
     "webdata/autofill_webdata_backend_impl.h",
     "webdata/autofill_webdata_service.cc",
     "webdata/autofill_webdata_service.h",
     "webdata/autofill_webdata_service_observer.h",
   ]
 
+  configs += [ "//build/config:precompiled_headers" ]
+
   deps = [
     "//base",
     "//base:i18n",
     "//base:prefs",
     "//components/autofill/core/common",
     "//components/infobars/core",
     "//components/keyed_service/core",
     "//components/os_crypt",
     "//components/pref_registry",
     "//components/rappor",
@@ skipping 132 matching lines @@
     "//sync",
     "//sync:test_support_sync_api",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libphonenumber",
     "//third_party/libjingle",
     "//ui/base",
     "//url",
   ]
 }