[task_driver] Add CorsHandler to /json/td/{taskId}
[task_driver] Add CorsHandler to /json/td/{taskId}

Bug: skia:11843
Change-Id: I03daea3d86a152819b1a6a416edea8d58ec93607
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/394016
Reviewed-by: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Commit-Queue: 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