Add dev, beta, stable signing for dev on temp M60 branch

BUG=None
TEST=None

Change-Id: Ic8bb2e13ac6732f07e2e63507eb2fb464af89b44
Reviewed-on: https://chromium-review.googlesource.com/517251
Reviewed-by: Josafat Garcia <josafat@chromium.org>
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
Commit-Queue: Josafat Garcia <josafat@chromium.org>
Tested-by: Josafat Garcia <josafat@chromium.org>
1 file changed