Explicitly use node.js in the cases where it is needed.

dart/frog/scripts/bootstrap/frogsh_bootstrap_wrapper.py

 # Copyright 2011 Google Inc. All Rights Reserved.
 
 import os
 import platform
 import shutil
 import stat
 import sys
 
 HOME = os.path.dirname(os.path.realpath(__file__))
 HOME = os.path.join(HOME, os.pardir, os.pardir)
@@ skipping 13 matching lines @@
 
 def main(args):
   product_dir = args[1]
   js_out = os.path.join(product_dir, 'frog', 'bin', 'frogsh')
   vm = os.path.join(product_dir, 'dart')
   id = platform.system()
   if id == 'Windows' or id == 'Microsoft':
     vm = vm + '.exe'
     shutil.copy(os.path.join(HOME, 'scripts', 'bootstrap', 'frogsh.bat'),
                 js_out + '.bat')
-  frog_args = ['frog.py', '--vm=' + vm, '--', '--out=' + js_out, 'minfrog.dart']
+  frog_args = ['frog.py', '--vm=' + vm,
+               '--js_cmd=node --crankshaft',
+               '--',
+               '--out=' + js_out, 'minfrog.dart']
 
   # TODO(ngeoffray): Compile frogsh without checks integrated.
   # if js_out.find('Release') != -1:
   exit_code = frog.main(frog_args)
   if exit_code:
     if js_out.find('Release') != -1:
       return exit_code
     else:
       with open(js_out, 'w') as f:
         f.write(FROGSH_FALLBACK)
 
   os.chmod(js_out, stat.S_IXUSR | stat.S_IXGRP | stat.S_IRUSR |
            stat.S_IRGRP | stat.S_IWUSR)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))