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Currently MD rounded corners are using layer masking to achieve the
desired clip for client views. This CL updates client views to make
use of the ui:Layer SetRoundedCornerRadius() fast path that
significantly improves performance vs layer masking.

Bug: 822075
Change-Id: I113c6b0101145518962b22940f653fb2cc93381f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359027
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798900}