Use precompiled headers for most large projects.

chrome/default_plugin/default_plugin.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',
+  ],
   'targets': [
     {
       'target_name': 'default_plugin',
       'type': 'static_library',
       'dependencies': [
         ':default_plugin_resources',
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/net/net.gyp:net_resources',
         '<(DEPTH)/third_party/icu/icu.gyp:icui18n',
         '<(DEPTH)/third_party/icu/icu.gyp:icuuc',
         '<(DEPTH)/third_party/libxml/libxml.gyp:libxml',
         '<(DEPTH)/third_party/npapi/npapi.gyp:npapi',
         '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_resources',
         '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_strings',
       ],
       'include_dirs': [
         '<(DEPTH)',
         '<(DEPTH)/third_party/wtl/include',
       ],
       'sources': [
         'plugin_impl_gtk.cc',
         'plugin_impl_gtk.h',
         'plugin_impl_mac.h',
         'plugin_impl_mac.mm',
         'plugin_impl_win.cc',
         'plugin_impl_win.h',
         'plugin_installer_base.cc',
-        'plugin_installer_base.h',      
+        'plugin_installer_base.h',
         'plugin_main.cc',
         'plugin_main.h',
       ],
       'conditions': [
         ['use_aura==1', {
           'sources/': [
             ['exclude', '^plugin_impl_win.cc'],
             ['exclude', '^plugin_impl_win.h'],
           ],
         }],
@@ skipping 32 matching lines @@
           'variables': {
             'grit_grd_file': 'default_plugin_resources.grd',
           },
           'includes': [ '../../build/grit_action.gypi' ],
         },
       ],
       'includes': [ '../../build/grit_target.gypi' ],
     },
   ],
 }