Add command line tool to query for all failed swarming tasks as a specific commit.
Add command line tool to query for all failed swarming tasks as a specific commit.

Bug: skia:7369
Change-Id: I3344fb9112ed843a31e378ba23f2de3174b090c3
Reviewed-on: https://skia-review.googlesource.com/79320
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot