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Currently NativeViewHost applies a masking path to the NativeView's
layer to achieve the rounded corners effect. Tbis CL updates the API
to use gfx::RoundedCornersF and uses the rounded corners layer fast
path for Aura platforms.

Bug: None
Change-Id: I038d7b01f315e930cd2577d1c6b4f5dc7f6ca5c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371309Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801472}