Merge "Make Activites touch opaque - DO NOT MERGE" into rvc-dev am: 838fc349

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18029146



Change-Id: Ic688d0df23417d2faf28129df103005f8fed5230
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>