viz: Move CreateResourceFromTextureMailbox from Display to LayerTree in OverlayTest

The usage of CreateResourceFromTextureMailbox is listed here:
https://docs.google.com/spreadsheets/d/1lnyONBganHkiQKw8J-3e3xC7STZkYvSh7dkzxSUFmPw/edit

BUG=757291

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I73327a885e5b4dc171c79b420b3913e9e648b6e4
Reviewed-on: https://chromium-review.googlesource.com/664309
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501631}
1 file changed