Merge "Add activity option flag for background starts for bubbles" into udc-dev am: 0dcaf197

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21686310



Change-Id: Id06e8525d5e8fa8463a1fa550d81c046b5712e2c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>