PerfTests: Updates to several tests. Bug: angleproject:6371 Change-Id: If71c79fd363f7463098b571550af6ceb0634c00d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3176440 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>