Merge "Make CoreStartable an Interface." into tm-qpr-dev am: a4bd4913ed

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20181423

Change-Id: Ibc913682b1ec67e3728302ad1950682a935d9842
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>