Needed to get access to the scratch buffer.

Bug: chromium:867089
Change-Id: I217bde149d24432e4baa276ead02ebc52a219958
Reviewed-on: https://chromium-review.googlesource.com/1149081Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1155097Reviewed-by: Jamie Madill <jmadill@chromium.org>