gpu/khronos_glcts_support: add support for GN builds

gpu/khronos_glcts_support/khronos_glcts_framework.gyp

 # Copyright 2014 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.
 
 {
   'includes': [
     'khronos_glcts.gypi',
+    'khronos_glcts_defaults.gypi',
   ],
   'targets': [
     {
       'target_name': 'khronos_glcts_framework',
       'type': 'static_library',
       'dependencies': [
         'delibs', 'qphelper', 'tcutil', 'glutil', 'tcutil_egl',
       ],
       'export_dependent_settings': [
         'delibs', 'qphelper', 'tcutil', 'glutil', 'tcutil_egl',
@@ skipping 220 matching lines @@
       },
       'export_dependent_settings': [
         '<(DEPTH)/third_party/khronos/khronos.gyp:khronos_headers',
       ],
       'sources': [
         '<@(tcutil_egl_srcs)',
       ],
     },
   ],
 }