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This CL introduces a GetCornerRadius() helper to the DialogDelegate
and a GetClientCornerRadii() helper to the BubbleFrameView. This will
help when implementing the rounded corners fast path for MD rounded
corners in a follow-up CL.

Bug: 822075
Change-Id: Ia90c56b0ba6d58d682bc9c14bae688c247d612d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359022
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798665}