Add device policy to enable ephemeral users

This adds a device policy to the protobuf file that will be used to
enable ephemeral users.

BUG=chromium-os:20004
TEST=unit_test *Policy*, chrome builds and runs


Review URL: http://codereview.chromium.org/9104038

git-svn-id: http://src.chromium.org/svn/trunk/src/chrome/browser/policy/proto@120620 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed