updateRendering() runs at full framerate during thermal throttling; should drop to half
<rdar://problem/112799115>
Pull request: https://github.com/WebKit/WebKit/pull/17172
Committed 267440@main (a33d2c717ecb): <https://commits.webkit.org/267440@main> Reviewed commits have been landed. Closing PR #17172 and removing active labels.