perf: Make Perf ingestion robust to the new 'samples' array.
perf: Make Perf ingestion robust to the new 'samples' array.

Stops ingestion from spewing massive amount of error logs.

BUG=skia:

Change-Id: I753edbe9b11c7425cbb1d9bf509a9517161045d3
Reviewed-on: https://skia-review.googlesource.com/5665
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