Merge "Dismiss screenshot UI on back gesture/button." into rvc-dev am: 50886ed9a2 am: f03a7b1ea7 am: 9378876427 am: 6c7cf9bf41

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11875978

Change-Id: I2003c9baff438054da0172e2294d3c0cf02eab2e