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Modify the highlight path generator to use a round rect override so
that the ink drop clipping code will pick it up. Tab close buttons use
the content bounds, all other usages use the local buttons + fixed
inset, so tweak the API to allow for this.

Test: manual
Bug: 1056490
Change-Id: I9815c50ba1f79b3a40284c628eafcf50bcd9ce58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307694
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790197}