Add demo_session_apps_path to UpgradeArcContainer request

This is expected to be set by Chrome if ARC container is being upgraded
during Chrome OS demo session set up, i.e. if Chrome is being run in
demo mode. For demo sessions, ARC setup is expected to load pre-installed
demo apps during container setup. The value of demo_session_apps_path
property should be absolute path to the squashfs image that contains
preinstalled apps.

BUG=chromium:842979
TEST=None

Change-Id: I0ecbbccdbff0719787e7b58074c96bfdb136a820
Reviewed-on: https://chromium-review.googlesource.com/1066493
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
1 file changed