- Moves all allocation retry logic into allocation.

Bug: chromium:756050
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I810d01f0a0a002b08bf3f82ea4195d636ab6e03a
Reviewed-on: https://chromium-review.googlesource.com/843230Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50305}