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This CL also add extra validation to perf_json_config_validator script (run on PRESUBMIT) to prevent this bug from happening again

Bug:865181
Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: Ie68f426d3e5f073c5239ef05e14b67ac89b6911b

NOTRY=true  # webkit_layout_tests flaky

Change-Id: Ie68f426d3e5f073c5239ef05e14b67ac89b6911b
Reviewed-on: https://chromium-review.googlesource.com/1142950
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576451}