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This is needed to determine if rounded corners
are needed via window visibility.

Bug: b/156276792
Test: On device
Change-Id: Ibd893ccdac4af1e72789f8217b99433a41b8b25f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202533
Commit-Queue: Shawn Gallea <sagallea@google.com>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771163}