Add per-fragment early-out for getCharNumAtPosition Blink Merge (to improve SVGTextQuery) - https://src.chromium.org/viewvc/blink?view=revision&revision=177230
Committed 268730@main (c0183789bb8a): <https://commits.webkit.org/268730@main> Reviewed commits have been landed. Closing PR #18469 and removing active labels.
<rdar://problem/116347457>