[automerger skipped] SurfaceFlinger: Implement drop input modes am: cbe9c105fc am: 4648ad64f2 -s ours am: f2a0e26203 -s ours am: 36cf85e10a -s ours

am skip reason: Merged-In Ibce11ee7df5b5c8c226ebfab29574a99cd656f6d with SHA-1 9b0d13dc44 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/16508594

Change-Id: Ie8c1ee80cfd1f7a657601aa76076eb356bbd3dd7