Eric Seidel 6583e4e952 Update big_red_button instructions and add --dry-run mode.
I also made the add_argument blocks shorter by allowing more
than one named arg per line.  I removed the metavar lines
and action=store lines since one was only used in help messages
and the other was already matching the default for add_argument.

R=johnmccutchan@google.com

Review URL: https://codereview.chromium.org/1234803004 .
2015-07-13 15:24:54 -07:00
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