This is in an attempt to diagnose why it's seen as a highly idle step
in some traces, e.g.
https://docs.google.com/document/d/1bdlWAWeP3j2yo2DYfeok6URqFCrt57yx-nucGMybGGQ/edit#heading=h.1baa99zf8jc0
https://drive.google.com/file/d/1kLfH1dM5TOJbiD2v_KJsxWXakpd2k-7q/view

R=mlippautz@chromium.org

Bug: chromium:813824
Change-Id: I743d9b7430a3970751398b4c5a4d569fbcae2cbe
Reviewed-on: https://chromium-review.googlesource.com/926844Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51400}