Merge "Starting sandbox activity should not start a new sandbox process" into udc-dev am: 94a4ffa380 am: 0291036472

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23262457

Change-Id: I892792ee6c41b39837b7792804ea4b0016b3da8b
Signed-off-by: Automerger Merge Worker <[email protected]>