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

[automerger skipped] Add RootTargetPreparer for explicitly specifying the root dependency am: 4cc54592 am: 6ae8d5b1 -s ours am: 94eb6be1 -s ours am: 3cf3e7cc -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/+/26804795



Change-Id: I7c53aefbe5caca2c3f2220156ee459c460fc2160
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>