Merge "A flag for server side experimentation." into tm-qpr-dev am: 93aba1ca57

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

Change-Id: Ib1ffbd9ad9bff4dd281ef9e1a849bd06403ed584
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>