Merge "Allow extending vtables" am: aa16c32035

Original change: https://android-review.googlesource.com/c/platform/development/+/2241773

Change-Id: I924ed5e7ca3119d9cac6543a55ebc214f2323802
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>