Disable flaky perf benchmark

Bug: skia:7551
Change-Id: Id1e4a345849f0e596d38278e5e9d88dfa476d678
Reviewed-on: https://skia-review.googlesource.com/101127
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
3 files changed