Merge "Flow utility functions: pairwise + setChanges" into tm-qpr-dev am: 88684d2d am: 5a5a8a5c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19745892



Change-Id: Id535ff1e87a8226f7de9d06d988ac7418c3e2ff5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>