Fix missing include directories in v8.gyp.

tools/gyp/v8.gyp

 # Copyright 2009 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 134 matching lines @@
       },
     },
     {
       'target_name': 'v8_snapshot',
       'type': '<(library)',
       'dependencies': [
         'mksnapshot',
         'js2c',
         'v8_base',
       ],
+      'include_dirs': [
+        '../../src',
+      ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/libraries-empty.cc',
         '<(INTERMEDIATE_DIR)/snapshot.cc',
       ],
       'actions': [
         {
           'action_name': 'run_mksnapshot',
           'inputs': [
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)mksnapshot<(EXECUTABLE_SUFFIX)',
           ],
@@ skipping 334 matching lines @@
           ],
         },
       ],
     },
     {
       'target_name': 'mksnapshot',
       'type': 'executable',
       'dependencies': [
         'v8_nosnapshot',
       ],
+      'include_dirs': [
+        '../../src',
+      ],
       'sources': [
         '../../src/mksnapshot.cc',
       ],
     }
   ],
 }