Perf - Track files and branches where we get no data.
Perf - Track files and branches where we get no data.

Change-Id: Iee3899ad1b5dc50cb52d8133cc8e1af0274cf5d3
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/242861
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@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