Use precompiled headers for most large projects.

chrome/chrome_dll.gypi

 # 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.
 {
   'target_defaults': {
     'variables': {
       'chrome_dll_target': 0,
     },
     'target_conditions': [
       ['chrome_dll_target==1', {
@@ skipping 63 matching lines @@
                 # chrome_dll_syzygy.gypi for the subsequent defintion of the
                 # Windows chrome_dll target.
                 'dll_target_name': 'chrome_dll_initial',
               }, {
                 'dll_target_name': 'chrome_dll',
               }],
             ],
           },
           'target_name': '<(dll_target_name)',
           'type': 'shared_library',
+          'msvs_disable_precompiled_header': '1',
           'dependencies': [
             '<@(chromium_dependencies)',
             'app/policy/cloud_policy_codegen.gyp:policy',
           ],
           'conditions': [
             ['OS=="win"', {
               'product_name': 'chrome',
               'dependencies': [
                 # On Windows, link the dependencies (libraries) that make
                 # up actual Chromium functionality into this .dll.
@@ skipping 637 matching lines @@
                   'LinkIncremental': '<(msvs_debug_link_nonincremental)',
                 },
               },
             },
           },
         },  # target chrome_dll
       ],
     }],
   ],
 }