Use precompiled headers for most large projects.

chrome/chrome.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,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 755 matching lines @@
               '$(SDKROOT)/System/Library/Frameworks/IOKit.framework',
             ],
           },
         }],
       ],
     },
     # A library for sending and receiving server-issued notifications.
     {
       'target_name': 'sync_notifier',
       'type': 'static_library',
+      'msvs_disable_precompiled_header': '1',
       'sources': [
         'browser/sync/notifier/cache_invalidation_packet_handler.cc',
         'browser/sync/notifier/cache_invalidation_packet_handler.h',
         'browser/sync/notifier/chrome_invalidation_client.cc',
         'browser/sync/notifier/chrome_invalidation_client.h',
         'browser/sync/notifier/chrome_system_resources.cc',
         'browser/sync/notifier/chrome_system_resources.h',
         'browser/sync/notifier/invalidation_notifier.h',
         'browser/sync/notifier/invalidation_notifier.cc',
         'browser/sync/notifier/invalidation_util.cc',
@@ skipping 922 matching lines @@
             'destination': '<(PRODUCT_DIR)',
             'files': [
               '<(INTERMEDIATE_DIR)/repack/chrome.pak'
             ],
           },
         ],
       }],  # targets
     }],  # os_posix == 1 and OS != "mac"
   ],  # 'conditions'
 }