Use precompiled headers for most large projects.

third_party/cacheinvalidation/cacheinvalidation.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': {
     # This library should build cleanly with the extra warnings turned on
     # for Chromium.
     'chromium_code': 1,
     # The root directory for the proto files.
@@ skipping 80 matching lines @@
       ],
       # This target exports a hard dependency because it contains generated
       # header files.
       'hard_dependency': 1,
     },
     # The main cache invalidation library.  External clients should depend
     # only on this.
     {
       'target_name': 'cacheinvalidation',
       'type': 'static_library',
+      'msvs_disable_precompiled_header': '1',
       'sources': [
         'overrides/google/cacheinvalidation/callback.h',
         'overrides/google/cacheinvalidation/compiler-specific.h',
         'overrides/google/cacheinvalidation/gmock.h',
         'overrides/google/cacheinvalidation/googletest.h',
         'overrides/google/cacheinvalidation/v2/logging.h',
         'overrides/google/cacheinvalidation/md5.h',
         'overrides/google/cacheinvalidation/v2/mutex.h',
         'overrides/google/cacheinvalidation/random.h',
         'overrides/google/cacheinvalidation/v2/scoped_ptr.h',
@@ skipping 84 matching lines @@
         '../../base/base.gyp:base',
         # Needed by run_all_unittests.cc.
         '../../base/base.gyp:test_support_base',
         '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
         'cacheinvalidation',
       ],
     },
   ],
 }