Use precompiled headers for most large projects.

base/base.gyp

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
+    '../build/win_precompile.gypi',
     'base.gypi',
   ],
   'targets': [
     {
       'target_name': 'base_i18n',
       'type': '<(component)',
       'dependencies': [
         'base',
         'third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../third_party/icu/icu.gyp:icui18n',
@@ skipping 380 matching lines @@
           'msvs_settings': {
             'VCLinkerTool': {
               'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS
             },
           },
         },
       ],
     }],
   ],
 }