Improve Skia configuration.

skia/skia_common.gypi

 # Copyright 2013 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.
 
 # This gypi file handles the removal of platform-specific files from the
 # Skia build.
 {
+  'include_dirs': [
+    '..',
+    'config',
+  ],
+
   'conditions': [
     [ 'OS != "android"', {
       'sources/': [
          ['exclude', '_android\\.(cc|cpp)$'],
       ],
     }],
     [ 'OS != "ios"', {
       'sources/': [
          ['exclude', '_ios\\.(cc|cpp|mm?)$'],
       ],
     }],
     [ 'OS != "mac"', {
       'sources/': [
         ['exclude', '_mac\\.(cc|cpp|mm?)$'],
       ],
     }],
     [ 'OS != "win"', {
       'sources/': [ ['exclude', '_win\\.(cc|cpp)$'] ],
     }],
     [ 'use_glib == 0', {
       'sources/': [ ['exclude', '_linux\\.(cc|cpp)$'] ],
     }],
   ],
 
+  'direct_dependent_settings': {
+    'include_dirs': [
+      '..',
+      'config',
+    ],
+  },
+
   'msvs_disabled_warnings': [4244, 4267, 4341, 4345, 4390, 4554, 4748, 4800],
 }