[automerger skipped] Refactors Sandbox to more easily add new tutorials. am: 28095168e9 -s ours

am skip reason: Change-Id Id893869cb59609141dcdbdca01744d0f5952b546 with SHA-1 9c89358c7d is in history

Change-Id: Iea93bd2ac8cde559d2b1a176a2e02ed46aea378f