Don't trigger re-layout when 'stroke' changes

Layout only checks for existence of 'stroke', using it to determine
whether stroke bounds should be computed or not.

Bug: 435097
Change-Id: I1b25d4da7f2d5215beadaa4f1941c5d9c8243500
Reviewed-on: https://chromium-review.googlesource.com/c/1491254
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#636010}
1 file changed