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This is a reland of d939a1e1.

Keeps the ink drop clip and ring path generators separate, as the ring
handles RTL implicitly, but the clip do not.

Original change's description:
> views: Remove InkDropMask from tab close button.
>
> 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}

Bug: 1056490
Change-Id: I85d9bb217ec3659fa5244e9280ac237a26323192
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308874
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790940}