Tests: reduce load on perf bots by collecting less data Collecting this data takes a significant amount of resources but we do not actively use it at the moment. Disable --split-shard-samples (will avoid separate calibration on each shard) Reduce samples to 6 (from default 10) Bug: angleproject:7671 Change-Id: I87d45f21badb30ed44de9b9854c94fe7f67ecdc8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4605335 Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>