[automerger skipped] SurfaceControl: Add setDropInputMode api am: a84612483f am: 1a130170c9 -s ours

am skip reason: Merged-In Ifcb4133306a43874e74e8fb0f42b60842daf6f25 with SHA-1 e2b63cb1f9 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16740078

Change-Id: I81079c9d8d8cdc91d9db2f94a7ec43cd599a8050