Introduce a notion of "v8_code" in gyp config files.

src/third_party/vtune/v8vtune.gyp

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 {
+  'variables': {
+    'v8_code': 1,
+  },
   'includes': ['../../../build/common.gypi'],
   'targets': [
     {
       'target_name': 'v8_vtune',
       'type': 'static_library',
       'dependencies': [
         '../../../tools/gyp/v8.gyp:v8',
       ],
       'sources': [
         'ittnotify_config.h',
         'ittnotify_types.h',
         'jitprofiling.cc',
         'jitprofiling.h',
         'v8-vtune.h',
         'vtune-jit.cc',
         'vtune-jit.h',
       ],
       'direct_dependent_settings': {
         'defines': ['ENABLE_VTUNE_JIT_INTERFACE',],
         'conditions': [
           ['OS != "win"', {
             'libraries': ['-ldl',],
           }],   
         ],
       },
     },
   ],
 }