Make "type" optional in WakeLock.request()

Category: Capabilities (Fugu)
Type: No developer-visible change
Status: Enabled by default (Chrome 88)
Intent stage: Prepare to ship

Summary

Implement https://github.com/w3c/screen-wake-lock/pull/291, which makes the "type" parameter in WakeLock.request() optional and defaulting to "screen", which is the only allowed value at the moment. In other words, the following two lines would do the exact same thing: navigator.wakeLock.request() navigator.wakeLock.request("screen")

Motivation

This incorporates feedback from the ongoing TAG review. The discussion started in https://github.com/w3c/screen-wake-lock/pull/288, where we were just going to justify why |type| is required, and it turned into a PR to make it optional after all.

Standards & signals

Specification: https://w3c.github.io/screen-wake-lock/#the-wakelock-interface
Firefox: Positive
Safari: No signal — No activity on the mailing list after https://lists.webkit.org/pipermail/webkit-dev/2020-February/031083.html
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1133696

Explainers: https://github.com/w3c/screen-wake-lock/blob/gh-pages/explainer.md

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