Add precompiled headers to GN build for large targets.

chrome/installer/util/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("//testing/test.gni")
 
 static_library("util") {
   deps = [
     "//base",
@@ skipping 50 matching lines @@
       ":strings",
       "//base/third_party/dynamic_annotations",
       "//components/metrics",
       "//courgette:courgette_lib",
       "//crypto",
       "//third_party/bspatch",
       "//third_party/icu",
       "//third_party/lzma_sdk",
     ]
 
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+    configs += [
+      "//build/config:precompiled_headers",
+
+      # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+      "//build/config/compiler:no_size_t_to_int_warning",
+    ]
 
     # TODO(GYP) hook up corresponding version of installer_util_nacl_win64 in GN
     sources += [
       "advanced_firewall_manager_win.cc",
       "advanced_firewall_manager_win.h",
       "app_command.cc",
       "app_command.h",
       "app_commands.cc",
       "app_commands.h",
       "app_registration_data.h",
@@ skipping 191 matching lines @@
       # TODO(rockot): Remove this hack when we fix mojo environment deps.
       # See http://crbug.com/501385
       "//mojo/environment:chromium",
       "//testing/gmock",
       "//testing/gtest",
     ]
 
     # TODO(GYP) manifest: $(ProjectDir)\\installer\\mini_installer\\mini_installer.exe.manifest
   }
 }  # is_win