Made blink gyps and gns to public oilpan configuration

Source/build/features.gypi

 #
 # Copyright (C) 2009 Google Inc. 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
@@ skipping 19 matching lines @@
 
 {
   # The following defines turn WebKit features on and off.
   'variables': {
     'feature_defines': [
       'ENABLE_LAYOUT_UNIT_IN_INLINE_BOXES=0',
       # WTF_USE_DYNAMIC_ANNOTATIONS=1 may be defined in build/common.gypi
       # We can't define it here because it should be present only
       # in Debug or release_valgrind_build=1 builds.
     ],
+    'public_feature_defines': [
+    ],
+
     # We have to nest variables inside variables so that they can be overridden
     # through GYP_DEFINES.
     'variables': {
       # Enables the Oilpan garbage-collection infrastructure.
       'enable_oilpan%': 0,
       'gc_profile_heap%': 0,
       'gc_profile_marking%': 0,
       'blink_logging_always_on%': 0,
     },
     'conditions': [
@@ skipping 20 matching lines @@
           # allow most WebAudio features to work on Android.
           'ENABLE_WEB_AUDIO=1',
         ],
       }],
       ['use_default_render_theme==1', {
         'feature_defines': [
           'WTF_USE_DEFAULT_RENDER_THEME=1',
         ],
       }],
       ['enable_oilpan==1', {
-        'feature_defines': [
+        'public_feature_defines': [
           'ENABLE_OILPAN=1',
         ],
       }],
       ['gc_profile_heap==1', {
         'feature_defines': [
           'ENABLE_GC_PROFILING=1',
           'ENABLE_GC_PROFILE_HEAP=1',
         ],
       }],
       ['gc_profile_marking==1', {
         'feature_defines': [
           'ENABLE_GC_PROFILING=1',
           'ENABLE_GC_PROFILE_MARKING=1',
         ],
       }],
       ['blink_logging_always_on==1', {
         'feature_defines': [
           'LOG_DISABLED=0',
         ],
       }],
     ],
+
+    'feature_defines': [
+      '<@(public_feature_defines)'
+    ]
   },
 }