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This is a reland of 6f0b5d97

A baseline is added for a test that no longer (always) times out because
of this fix. The test has a few failing subtests so a baseline is needed.

Original change's description:
> [blinkpy] Find manifest items for tests by URL
>
> When running WPT in web_tests, test names are more like URLs instead of
> file paths (to be precise, the part of a test name after external/wpt is
> a WPT URL), because WPT can generate multiple tests (variations) for a
> single test file (e.g. .any.js, ?run_type).
>
> Therefore, when asking questions like "is a test slow?", we need to find
> the manifest item for that test by URL instead of by file path; whereas
> if we want to know if a file in external/wpt is a test file, we find
> the manifest item(s) for that file by file path.
>
> This CL separates the two types of manifest queries, and chooses the
> correct one for each call site. Besides, unit tests are improved to
> cover the WPT variations (.any.js & ?run_type).
>
> Bug: 831975, 800570
> Change-Id: I230d5ec7df06b7df1387da1b93788d6cae55d153
> Reviewed-on: https://chromium-review.googlesource.com/1043160
> Commit-Queue: Robert Ma <robertma@chromium.org>
> Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#556043}

Bug: 831975, 800570
Change-Id: I65e818473153b134af8dc78677b1b678d196aada
Reviewed-on: https://chromium-review.googlesource.com/1044586Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556126}