Merge "Add multitree sample build script" am: ea3c580c00

Original change: https://android-review.googlesource.com/c/platform/development/+/2179374

Change-Id: Id12670ebc9c220d5cb78e9b33fd348fe5e618982
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>