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Allows ws clients to close touch ui on events outside their windows.

Add a new PointerWatcher plumbing to [Mus]ViewsDelegate.
Wires up watchers to the Mus-only PointerWatcherEventRouter.
(ui/views/mus/* is not allowed as a dependency of ui/views/*)

Destroy the touch selection ui on PointerWatcher mouse events.

Bug: 884394, 887725
Test: Mouse events outside the KSV window close KSV text touch ui.
Change-Id: I0e41da4d03719001191f7d5ab669bcc1805bd63c
Reviewed-on: https://chromium-review.googlesource.com/1232955Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593001}