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

[automerger skipped] Add RootTargetPreparer for explicitly specifying the root dependency am: 4cc54592 am: 7d585b71 am: d00b78e6 -s ours am: 695e8deb -s ours am: d031439d -s ours am: 7f788fcd -s ours

am skip reason: Merged-In Ia81ba888aca96ca626c2a2464e3f0e9146bae231 with SHA-1 4cc54592 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/26804795



Change-Id: Ie3b07a7964ba44666ea49a4fb11d2e9f241ca9cb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>