Use precompiled headers for most large projects.

third_party/harfbuzz/harfbuzz.gyp

 # Copyright (c) 2009 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.
 
 {
   'conditions': [
     ['use_harfbuzz_ng==0', {
+      'includes': [
+        '../../build/win_precompile.gypi',
+      ],
       'targets': [
         {
           'target_name': 'harfbuzz',
           'type': 'static_library',
           'sources': [
             'contrib/harfbuzz-freetype.c',
             'contrib/harfbuzz-unicode.c',
             'contrib/harfbuzz-unicode-tables.c',
             'src/harfbuzz-buffer.c',
             'src/harfbuzz-stream.c',
@@ skipping 40 matching lines @@
             '../harfbuzz-ng/harfbuzz.gyp:harfbuzz'
           ],
           'export_dependent_settings': [
             '../harfbuzz-ng/harfbuzz.gyp:harfbuzz'
           ],
         }
       ]
     }]
   ]
 }