Reland "[heap] New heuristics for starting of incremental marking. (patchset #9 id:160001 of https://codereview.chromium.org/2364923002/ )"

This reverts commit a5440d11.

BUG=chromium:616434
TBR=hpayer@chromium.org
LOG=NO

Review-Url: https://codereview.chromium.org/2379663002
Cr-Commit-Position: refs/heads/master@{#39838}