Add explicit "python" to subprocess args in test wrapper script

tools/test-wrapper-gypbuild.py

 #!/usr/bin/env python
 #
 # 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
@@ skipping 206 matching lines @@
     parser.print_help()
     return 1
 
   workspace = abspath(join(dirname(sys.argv[0]), '..'))
   returncodes = 0
 
   if not options.no_presubmit:
     print ">>> running presubmit tests"
     returncodes += subprocess.call([workspace + '/tools/presubmit.py'])
 
-  args_for_children = [workspace + '/tools/test.py'] + PassOnOptions(options)
+  args_for_children = ['python']
+  args_for_children += [workspace + '/tools/test.py'] + PassOnOptions(options)
   args_for_children += ['--no-build', '--build-system=gyp']
   for arg in args:
     args_for_children += [arg]
   env = os.environ
 
   for mode in options.mode:
     for arch in options.arch:
       print ">>> running tests for %s.%s" % (arch, mode)
       if options.buildbot:
         shellpath = workspace + '/' + options.outdir + '/' + mode
         mode = mode.lower()
       else:
         shellpath = workspace + '/' + options.outdir + '/' + arch + '.' + mode
       env['LD_LIBRARY_PATH'] = shellpath + '/lib.target'
       shell = shellpath + "/d8"
-      child = subprocess.Popen(' '.join(args_for_children +
-                                        ['--arch=' + arch] +
-                                        ['--mode=' + mode] +
-                                        ['--shell=' + shell]),
+      cmdline = ' '.join(args_for_children +
+                         ['--arch=' + arch] +
+                         ['--mode=' + mode] +
+                         ['--shell=' + shell])
+      # TODO(jkummerow): This print is temporary.
+      print "Executing: %s" % cmdline
+
+      child = subprocess.Popen(cmdline,
                                shell=True,
                                cwd=workspace,
                                env=env)
       returncodes += child.wait()
 
   if len(options.mode) == 0 and len(options.arch) == 0:
     print ">>> running tests"
     shellpath = workspace + '/' + options.outdir
     env['LD_LIBRARY_PATH'] = shellpath + '/lib.target'
     shell = shellpath + '/d8'
     child = subprocess.Popen(' '.join(args_for_children +
                                       ['--shell=' + shell]),
                              shell=True,
                              cwd=workspace,
                              env=env)
     returncodes = child.wait()
 
   return returncodes
 
 
 if __name__ == '__main__':
   sys.exit(Main())