Import Reversed adapter from Chromium and use it in v8.

tools/gyp/v8.gyp

 # Copyright 2012 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 1310 matching lines @@
     {
       'target_name': 'v8_libbase',
       'type': 'static_library',
       'variables': {
         'optimize': 'max',
       },
       'include_dirs+': [
         '../..',
       ],
       'sources': [
+        '../../src/base/adapters.h',
         '../../src/base/atomicops.h',
         '../../src/base/atomicops_internals_arm64_gcc.h',
         '../../src/base/atomicops_internals_arm_gcc.h',
         '../../src/base/atomicops_internals_atomicword_compat.h',
         '../../src/base/atomicops_internals_mac.h',
         '../../src/base/atomicops_internals_mips_gcc.h',
         '../../src/base/atomicops_internals_ppc_gcc.h',
         '../../src/base/atomicops_internals_tsan.h',
         '../../src/base/atomicops_internals_x86_gcc.cc',
         '../../src/base/atomicops_internals_x86_gcc.h',
@@ skipping 492 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }