GitLab

Notably includes
https://fuchsia.googlesource.com/magenta/+/396b28ef2039e962c19f9d972d72ed56aa665d5b
which makes the POSIX-y impl of PartitionAlloc work on Fuchsia, so
enable those tests.

TBR=wez@chromium.org

Bug: 706592, 707030
Change-Id: I81969597e87969c755afb6e538bccf5ab1cf1eb9
Reviewed-on: https://chromium-review.googlesource.com/600987Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491825}