[automerger skipped] Add RootTargetPreparer for explicitly specifying the root...

[automerger skipped] Add RootTargetPreparer for explicitly specifying the root dependency am: 58077070 am: 8682e50f am: 1ff5e85f -s ours am: 421f4c54 -s ours

am skip reason: Merged-In I9b34a85025a6aa4f138483202fd11db0cbb8b04b with SHA-1 58077070 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26928402



Change-Id: I4e51269fc1a5e821ca4ad433b99072886851c07b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>