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This reverts commit 301c89e2.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Remove "Skipped" file and Port.skips_perf_test
> 
> I believe this might be dead code; I'm not sure if
> the layout test runner is used to run any Blink
> performance tests.
> 
> The last related change was last year:
> https://codereview.chromium.org/2734823006
> 
> Before that, all changes seem to be from about 5 years ago.
> 
> Change-Id: Ib1a23055391112c83b97e000707f0b2f333040e5
> Reviewed-on: https://chromium-review.googlesource.com/966484
> Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#545710}

TBR=qyearsley@chromium.org,tkent@chromium.org,yoichio@chromium.org

Change-Id: I3b905a29342fa0a65b8c2dbb7e643d62cf39679f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/980792Reviewed-by: Emily Hanley <eyaich@chromium.org>
Commit-Queue: Emily Hanley <eyaich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545795}