Add chrome_cleaner sandboxed engine Mojo interfaces

R=wfh

Bug: 830892
Change-Id: I0a4b25b2ba04b65a80e2c03e9151b5ef55912432
Reviewed-on: https://chromium-review.googlesource.com/1171737
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585025}
9 files changed