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

test/cctest/cctest.gyp

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 {
-  'includes': ['../../build/common.gypi'],
   'variables': {
+    'v8_code': 1,
     'generated_file': '<(SHARED_INTERMEDIATE_DIR)/resources.cc',
   },
+  'includes': ['../../build/common.gypi'],
   'targets': [
     {
       'target_name': 'cctest',
       'type': 'executable',
       'dependencies': [
         'resources',
       ],
       'include_dirs': [
         '../../src',
       ],
@@ skipping 160 matching lines @@
             '<@(_outputs)',
             'TEST',  # type
             'off',  # compression
             '<@(file_list)',
           ],
         }
       ],
     },
   ],
 }