GitLab

If we're backgrounded, the OS may aggressively kill procs we try to
start. Avoid creating the Viz proc while backgrounded, instead wait for
us to come to foreground.

Bug: 866631
Change-Id: I01c73707bbb65dcbc87eda1b344de2ce72647b5d
Reviewed-on: https://chromium-review.googlesource.com/1239219
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593350}