Generate shim headers for libpng

third_party/libpng/libpng.gyp

 # Copyright (c) 2012 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': {
     'conditions': [
       [ 'os_posix == 1 and OS != "mac" and OS != "android"', {
         # Maybe link to system .so once the security concerns are thought
         # through, since we already use it due to GTK.
@@ skipping 91 matching lines @@
         {
           'target_name': 'libpng',
           'type': 'none',
           'dependencies': [
             '../zlib/zlib.gyp:zlib',
           ],
           'direct_dependent_settings': {
             'cflags': [
               '<!@(<(pkg-config) --cflags libpng)',
             ],
-            'defines': [
-              'USE_SYSTEM_LIBPNG',
-            ],
           },
           'link_settings': {
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other libpng)',
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l libpng)',
             ],
           },
+          'variables': {
+            'headers_root_path': '.',
+            'header_filenames': [
+              'png.h',
+              'pngconf.h',
+            ],
+          },
+          'includes': [
+            '../../build/shim_headers.gypi',
+          ],
         },
       ],
     }],
   ],
 }