[perf] Fix retrieving details.
[perf] Fix retrieving details.

Change-Id: I11a155120b5dec9239684cb9a4809c81ab7b5a87
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/272964
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@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