Fix running skydb under chromoting.

sky/tools/skydb

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from skypy.skyserver import SkyServer
 import argparse
 import json
 import logging
 import os
@@ skipping 169 matching lines @@
             subprocess.check_call([
                 'adb', 'forward', port_string, port_string
             ])
             self.pids['remote_sky_command_port'] = args.command_port
 
         shell_command = self._build_mojo_shell_command(args)
 
         if not is_android:
             # Desktop-only work-around for mojo crashing under chromoting.
             if args.use_osmesa:
-                shell_args.append(
+                shell_command.append(
                     '--args-for=mojo:native_viewport_service --use-osmesa')
 
             # On android we can't launch inside gdb, but rather have to attach.
             if args.gdb:
                 shell_command = ['gdbserver', ':%s' % GDB_PORT] + shell_command
 
         print ' '.join(map(pipes.quote, shell_command))
         self.pids['mojo_shell_pid'] = subprocess.Popen(shell_command).pid
 
         if args.gdb and is_android:
@@ skipping 193 matching lines @@
         load_parser.set_defaults(func=self.load_command)
 
         args = parser.parse_args()
         args.func(args)
 
         self._write_pid_file(PID_FILE_PATH, self.pids)
 
 
 if __name__ == '__main__':
     SkyDebugger().main()