Avoid using posix interpretation for shlex.split. posix=True swallows `\`-es, making the code fail on windows.
Avoid using posix interpretation for shlex.split.
posix=True swallows `\`-es, making the code fail on windows.

Also print the args after they are parsed for easier debugging.

BUG=
R=eernst@google.com, whesse@google.com

Review URL: https://chromiumcodereview.appspot.com//1193853002.

dart-lang/package-bots