Add new platform file to V8 gyp file.

build/temp_gyp/v8.gyp

 # Copyright (c) 2009 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.
 
 # TODO(mark): Upstream this file to v8.
 {
   'variables': {
     'chromium_code': 1,
     'base_source_files': [
       '../../v8/src/third_party/dtoa/dtoa.c',
@@ skipping 124 matching lines @@
       '../../v8/src/objects.cc',
       '../../v8/src/objects.h',
       '../../v8/src/oprofile-agent.h',
       '../../v8/src/oprofile-agent.cc',
       '../../v8/src/parser.cc',
       '../../v8/src/parser.h',
       '../../v8/src/platform-freebsd.cc',
       '../../v8/src/platform-linux.cc',
       '../../v8/src/platform-macos.cc',
       '../../v8/src/platform-nullos.cc',
+      '../../v8/src/platform-posix.cc',
       '../../v8/src/platform-win32.cc',
       '../../v8/src/platform.h',
       '../../v8/src/prettyprinter.cc',
       '../../v8/src/prettyprinter.h',
       '../../v8/src/property.cc',
       '../../v8/src/property.h',
       '../../v8/src/regexp-macro-assembler-arm.cc',
       '../../v8/src/regexp-macro-assembler-arm.h',
       '../../v8/src/regexp-macro-assembler-ia32.cc',
       '../../v8/src/regexp-macro-assembler-ia32.h',
@@ skipping 395 matching lines @@
           ]},
         }],
         [ 'OS=="win"', {
           'sources!': [ '../../v8/src/d8-readline.cc' ],
         }],
       ],
     },
   ]}], # OS != "linux" (temporary, TODO(sgk))
   ],
 }