export skia defines to its clients, so they see the same conditional code...

skia/skia.gyp

 # Copyright (c) 2010 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': 'skia',
       'type': '<(library)',
       'msvs_guid': 'CD9CA56E-4E94-444C-87D4-58CA1E6F300D',
@@ skipping 750 matching lines @@
           '../third_party/skia/include/config',
           '../third_party/skia/include/core',
           '../third_party/skia/include/effects',
           '../third_party/skia/include/gpu',
           '../third_party/skia/gpu/include',
           'ext',
         ],
         'mac_framework_dirs': [
           '$(SDKROOT)/System/Library/Frameworks/ApplicationServices.framework/Frameworks',
         ],
+        'defines': [
+          'SK_BUILD_NO_IMAGE_ENCODE',
+          'GR_GL_CUSTOM_SETUP_HEADER="GrGLConfig_chrome.h"',
+          'GR_SKIP_2POINTRADIAL_PROGRAMS',
+        ],
       },
     },
 
     # Due to an unfortunate intersection of lameness between gcc and gyp,
     # we have to build the *_SSE2.cpp files in a separate target.  The
     # gcc lameness is that, in order to compile SSE2 intrinsics code, it
     # must be passed the -msse2 flag.  However, with this flag, it may
     # emit SSE2 instructions even for scalar code, such as the CPUID
     # test used to test for the presence of SSE2.  So that, and all other
     # code must be compiled *without* -msse2.  The gyp lameness is that it
@@ skipping 61 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: