[automerger skipped] Add RootTargetPreparer for explicitly specifying the root dependency am: 4cc5459215 am: 7d585b7112 am: d00b78e6bf -s ours am: 695e8deb20 -s ours am: d031439d88 -s ours

am skip reason: Merged-In Ia81ba888aca96ca626c2a2464e3f0e9146bae231 with SHA-1 4cc5459215 is already in history

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

Change-Id: If1c1fe5756b5346b04334cb2410c7f364e662be7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>