Merge "A flag for server side experimentation." into tm-qpr-dev am: 93aba1ca am: d842e7b1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20511909



Change-Id: Ib364d9f538314227915deabde1a08477810e3364
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>