Merge "Flow utility functions: pairwise + setChanges" into tm-qpr-dev am: 88684d2dd3

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

Change-Id: Ic3543b240b3319f5747d2e36be46eb31927c2527
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>