Add precompiled headers to GN build for large targets.

sandbox/win/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("//testing/test.gni")
 
 source_set("sandbox") {
   sources = [
     "src/acl.cc",
     "src/acl.h",
@@ skipping 141 matching lines @@
       "src/sidestep/mini_disassembler.cpp",
       "src/sidestep/mini_disassembler.h",
       "src/sidestep/mini_disassembler_types.h",
       "src/sidestep/preamble_patcher.h",
       "src/sidestep/preamble_patcher_with_stub.cpp",
       "src/sidestep_resolver.cc",
       "src/sidestep_resolver.h",
     ]
   }
 
+  configs += [ "//build/config:precompiled_headers" ]
+
   deps = [
     "//base",
     "//base:base_static",
   ]
   if (current_cpu == "x86") {
     deps += [ ":copy_wow_helper" ]
   }
 }
 
 if (current_cpu == "x86") {
@@ skipping 119 matching lines @@
     "sandbox_poc/pocdll/network.cc",
     "sandbox_poc/pocdll/pocdll.cc",
     "sandbox_poc/pocdll/processes_and_threads.cc",
     "sandbox_poc/pocdll/registry.cc",
     "sandbox_poc/pocdll/spyware.cc",
     "sandbox_poc/pocdll/utils.h",
   ]
 
   defines = [ "POCDLL_EXPORTS" ]
 }