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

preparser/preparser.gyp

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 {
+  'variables': {
+    'v8_code': 1,
+  },
   'includes': ['../build/common.gypi'],
   'targets': [
     {
       'target_name': 'preparser',
       'type': 'executable',
       'conditions': [
         # preparser can't link against a shared library, so link against
         # the underlying static targets.
         ['v8_use_snapshot=="true"', {
           'dependencies': ['../tools/gyp/v8.gyp:v8_snapshot'],
         }, {
           'dependencies': [
             '../tools/gyp/v8.gyp:v8_nosnapshot.<(v8_target_arch)',
           ],
         }],
       ],
       'include_dirs+': [
         '../src',
       ],
       'sources': [
         'preparser-process.cc',
         '../include/v8-preparser.h',
         '../src/preparser-api.cc',
       ],
     },
   ],
 }