Merge "Support showing transient bars upon 3-finger swipe from trackpad" into...

Merge "Support showing transient bars upon 3-finger swipe from trackpad" into udc-qpr-dev am: e1467ef5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23578798



Change-Id: I9b58828e34fde1bb13f42323cefef44a47cf0d6b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>