Merge "Report user_cancellation when the user back scroll from the UI...

Merge "Report user_cancellation when the user back scroll from the UI activity" into udc-dev am: b21390f0 am: 366340e6 am: 3e8b5895 am: b93e8920

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22980754



Change-Id: Iaa0b83988f4114b3c40fe4466eb6b3140ac95a38
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>