Fine grain events are showing that LiveObjectVisitor::VisitBlackObjectsNoFail
is the suspiciously slow step, breaking it down further.
https://docs.google.com/document/d/1bdlWAWeP3j2yo2DYfeok6URqFCrt57yx-nucGMybGGQ/edit#heading=h.97pqg2eosnw8
https://drive.google.com/file/d/1FKZHkXtWK2fZCk_3PClPcbpzKilnbuOr/view

R=mlippautz@chromium.org

Bug: chromium:813824
Change-Id: Idcebcbb268d3e00f5f1e304c66564b4b9c85a064
Reviewed-on: https://chromium-review.googlesource.com/929161Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51447}