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Seat is corresponding to wl_saet and will be used to synchronize
wl_data_device#selection and wl_keyboard#enter events

Bug: 773978
Change-Id: Iaca10177f95aebac3822e6e534b9e640852e4ead
Reviewed-on: https://chromium-review.googlesource.com/770453Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Commit-Queue: Daichi Hirono <hirono@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517743}