Run layout to avoid stale layout during SetIsInert()

Speculative fix for crbug.com/789094

Bug: 789094
Change-Id: I1ea9215d049d84b4117f8836754f467c3d8ec9bc
Reviewed-on: https://chromium-review.googlesource.com/c/823582
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599171}
2 files changed