GitLab

Makes use of the clipping api for ink drop highlights/ripples.

ToggleButton: Ink-drop layers were always forwarded to the thumb view,
so the InkDropMask was unnecessary before.

FrameButton: InkDropMask relies a bit on the frame button internals, so
create a custom highlight path generator.

MediaButton: Used CircularMask which can be converted to a CircularPath.

Test: manual
Bug: 1056490
Change-Id: I16e4b853158136eee2ffba1a2de2b495437896f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310875Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790984}