Reland "Use reference counted pointers for ApkAssets" am: 1cf74939f4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23988011

Change-Id: Ia012b97dfaf169f0cb17c16080e0fc37c87cb626
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>