Merge "surfaceflinger: fix missing pure virtual declarations." am: f4e70632...

Merge "surfaceflinger: fix missing pure virtual declarations." am: f4e70632 am: d7a7f995 am: ffab144e

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2392152



Change-Id: I0395269db75c586c5bec4e5b6610654841d478c3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>