Allowing optional build of a WASM prototype behind a gyp define.

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 1375 matching lines @@
           'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE'],
         }, { # else icu_use_data_file_flag !=1
           'conditions': [
             ['OS=="win"', {
               'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_SHARED'],
             }, {
               'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC'],
             }],
           ],
         }],
+        ['v8_wasm!=0', {
+          'dependencies': ['../../third_party/wasm/src/wasm/wasm.gyp:wasm'],
+        }],
       ],
     },
     {
       'target_name': 'v8_libbase',
       'type': 'static_library',
       'variables': {
         'optimize': 'max',
       },
       'include_dirs+': [
         '../..',
@@ skipping 575 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }