Merge "Apply transaction when starting back nav" into tm-dev am: 9e9a9d36

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17570481



Change-Id: I07141f01d69b209ece88d0e08b38db467e0e888f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>