Bug 1466366 [wpt PR 11317] - Experimental Priority Hints support on fetch() API,...

Bug 1466366 [wpt PR 11317] - Experimental Priority Hints support on fetch() API, a=testonly

Automatic update from web-platform-testsExperimental Priority Hints support on fetch() API

Adding support for Priority Hints on the fetch() API under an
experimental flag. This adds the notion of importance to core/fetch
code, and adds a new member to the RequestInit dictionary to communicate
developer-specified "importance" downstream.

R=kinuko@chromium.org, kouhei@chromium.org, yhirano@chromium.org, yoav@yoav.ws

Bug: 821464
Change-Id: Ib96a128d77004029e86122c07552250c697dea5f
Reviewed-on: https://chromium-review.googlesource.com/1084063
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Yoav Weiss <yoav@yoav.ws>
Commit-Queue: Dominic Farolino <domfarolino@gmail.com>
Cr-Commit-Position: refs/heads/master@{#564410}

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wpt-commits: dae7535c0428fbf057a5c39f324d5a3f47ba64c7
wpt-pr: 11317