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This cl places the responsibility of determing the hit test component
on individual Views, which gets rid of some ash/ dependencies and
reduces code duplication.

The one behavioral change in classic Ash is that padding parts of
the hosted app button container (e.g. the medium sized space between
the menu button and the minimize button) are now HTCAPTION, i.e. can
be used to drag the frame rather than do nothing.

Bug: 854704
Change-Id: Ia290a42652a9acbf9b4b01c86941e8d2bdcadc48
Reviewed-on: https://chromium-review.googlesource.com/1145545Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577915}