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Negative margins are generally discouraged. We use a TouchDelegate instead to
increase the size of the touchable area surrounding the icon.

We also add a padding-based animation to transition between the borderless "on" state and the bordered "off" state

Bug: 1123996, 1135402, b/167409361
Change-Id: Ie51d4af5ed014d69d07981d486addd0a4643b76a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451399
Commit-Queue: Cathy Li <chili@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818514}