Add ability to pass through parameter from adb_run_mojo_shell

I would have liked the ability to pass through an array but I couldn't
see to get that to work.

BUG=none
TEST=none
R=qsr@chromium.org

Review URL: https://codereview.chromium.org/782823003

Cr-Commit-Position: refs/heads/master@{#307546}
1 file changed