Merge "Use activity-exit animation for translucent-only close" into udc-dev am: d31c9412 am: c677fb38

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23439461



Change-Id: I76c6fd41d04f5a7a4b5266769553225946dd4407
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>