Use precompiled headers for most large projects.

ppapi/ppapi_proxy.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.
 
 {
   'targets': [
     {
       'target_name': 'ppapi_proxy',
       'type': 'static_library',
+      'msvs_disable_precompiled_header': '1',
       'dependencies': [
         '../ipc/ipc.gyp:ipc',
         '../gpu/gpu.gyp:gpu_ipc',
         '../skia/skia.gyp:skia',
         '../ui/gfx/surface/surface.gyp:surface',
         'ppapi.gyp:ppapi_c',
         'ppapi_shared',
       ],
       'all_dependent_settings': {
         'include_dirs': [
@@ skipping 145 matching lines @@
         ['OS=="win"', {
         }],
         ['OS=="linux"', {
         }],
         ['OS=="mac"', {
         }]
       ],
     },
   ],
 }