Bug 1514457 [wpt PR 14538] - Idle Detection API: Prototype, a=testonly

Bug 1514457 [wpt PR 14538] - Idle Detection API: Prototype, a=testonly

Automatic update from web-platform-tests
Idle Detection API: Prototype

https://github.com/inexorabletash/idle-detection

Just a webification of the chrome.idle.* APIs.

Does not yet include:

- permission checks
- android integration
- final API

Intent to implement:

https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/OuwzBmH02M4

Design doc:

https://docs.google.com/document/d/1_XlwY3NuG2HwWEYVrR-MNvw_i4hj5ZNj3gKvxWqO0FU/edit

Bug: 878979
Change-Id: Ie45b34d5c29e04dfe65f8ff5127c6be34850d68f
Reviewed-on: https://chromium-review.googlesource.com/c/1351490
Commit-Queue: Sam Goto <goto@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Auto-Submit: Sam Goto <goto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624304}

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wpt-commits: f5239a2af2acb0c367064aef99f3f04157f2668e
wpt-pr: 14538