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

[automerger skipped] Add RootTargetPreparer for explicitly specifying the root dependency am: 6d6cd37c am: e190b45d am: 6629ab94 -s ours

am skip reason: Merged-In Ia81ba888aca96ca626c2a2464e3f0e9146bae231 with SHA-1 6d6cd37c is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/26789419



Change-Id: I915c5b07aa2b1807b18e941621730576d869faac
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>