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This also add this check to PRESUBMIT perf_json_config_validator script

Bug: 873389
Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: I16fd762e567d5a41d75a221456e12e14a03f0b85
Reviewed-on: https://chromium-review.googlesource.com/1171578Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#582422}