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

dart/frog/scripts/bootstrap/frog_bootstrap_wrapper.py

 # Copyright 2012 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)
 BUILDER_NAME = os.environ.get('BUILDBOT_BUILDERNAME')
 
 END_SCRIPT = '''
 VM = '%s'
 VM_FLAGS = '%s'
+D8 = '%s'
 if __name__ == '__main__':
   sys.exit(main(sys.argv))
 '''
 
 def main(args):
   product_dir = args[1]
   vm = os.path.join(product_dir, 'dart')
+  d8 = os.path.join(product_dir, 'd8')
   id = platform.system()
   if id == 'Windows' or id == 'Microsoft':
     vm = vm + '.exe'
   frog = os.path.join(product_dir, 'frog', 'bin', 'frog')
 
   shutil.copy(os.path.join(HOME, 'scripts', 'bootstrap', 'frog_wrapper.py'),
               frog)
   shutil.copy(os.path.join(HOME, 'scripts', 'bootstrap', 'frog.bat'),
               frog + '.bat')
 
   if 'Release' in product_dir and \
     (BUILDER_NAME == None or 'web' not in BUILDER_NAME):
     # We want to run our tests on the VM in production mode and in
     # developer mode. It turns out that developer mode is really slow
     # on the debug VM, so it makes sense to make the pairings:
     # (release VM, developer mode) and (debug VM, production mode).
     vm_flags = '--vm_flags=--enable_asserts --enable_type_checks'
   else:
-    # For test turnaround time, we run fully in release mode on 
+    # For test turnaround time, we run fully in release mode on
     # our web browser buildbots (and with debug VM).
     vm_flags = ''
 
   with open(frog, 'a+') as f:
-    f.write(END_SCRIPT % (vm, vm_flags))
+    f.write(END_SCRIPT % (vm, vm_flags, d8))
 
   os.chmod(frog, 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))