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This fixes a regression caused in r789502, which removed an apparently-
unnecessary SchedulePaint() call that was in fact necessary in some
cases.

Bug: 1145729
Change-Id: I37585cba537e725e0d34f41628295e5eca94bb91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587652
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836664}