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This CL adds the missing handlers that enable window move via the non-client
area of the window.

Bug: 991512
Change-Id: I4890969ea8fc4c0aa405cdf0db7fca7769dc7b15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1741684
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687352}