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Upstreams a utility which draws roundy corners on aura windows.

(Re-land of chromium/1841573 with fucshia build fix)

Bug: internal b/141369549
Test: manual
Change-Id: I366f9020632eeae9f3f1f5dad908f8aeb6a910ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845995Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703393}