[automerger skipped] Make CentralSurfaces an Interface. am: ee483863 am: 4ac82f1d am: 3aea4700 -s ours am: cc323498 -s ours

am skip reason: Merged-In Iab41b70e0c65d75560010d961dcb52a11fd237f5 with SHA-1 b1cdd3c5 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17756836



Change-Id: I86bba5a05b55bec9f8b2cfb614d22ae7bb892bfe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>