[heap] Simplify GC scheduling for unified heap GCs

Bug: 843903
Change-Id: Ib09bda7c2ae2c0afd0326a741f1c12f78924181f
Reviewed-on: https://chromium-review.googlesource.com/c/1268939
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598017}
1 file changed