Cache ntdll exports in ELF

chrome_elf/chrome_elf.gyp

 # Copyright 2013 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': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
     '../chrome/version.gypi',
   ],
   'targets': [
     {
       'target_name': 'chrome_elf',
       'type': 'shared_library',
       'include_dirs': [
         '..',
       ],
       'sources': [
         'chrome_elf.def',
         'chrome_elf_main.cc',
         'chrome_elf_main.h',
+        'chrome_elf_types.h',
+      ],
+      'defines': [
+        'CHROME_ELF_EXPORTS',
       ],
     },
   ],
-}
+}