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Part of an effort to describe highlight paths as a round rect struct.
The first user will be the cros toast button.

Test: manual
Bug: 1042303
Change-Id: I0d3a784f2421ea2feb8e3f5d4fc2e50bbcb20e55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038084Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739207}