Run headless tests on memory waterfall.

Relands the last missing bit of https://chromium-review.googlesource.com/1088754
This got reverted the last time because the msan bot had a too-old version of
Java.  This should now be fixed.

TBR=kbr

Bug: 843511,850731,844865,843732,843734
Change-Id: I2359e6e721fa603117dd2a0a2f11f459ee2a2ddf
Reviewed-on: https://chromium-review.googlesource.com/1094036
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565841}
4 files changed