Add date to job descriptions; wait for pending builds.

Previously if a trybot job got put into a pending queue
rather than starting immediately, we didn't notice and
would end up using the previous day's trybot image.  This
CL fixes that.

BUG=None
TEST=Ran successfully from role account.

Change-Id: I3dd2cf1edd639e562fa78769c86c99e4c51f3a0b
Reviewed-on: https://chrome-internal-review.googlesource.com/198610
Reviewed-by: Yunlian Jiang <yunlian@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
Commit-Queue: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
2 files changed