[automerger skipped] Merge "Merge "Don't allow background apps to change theme" into sc-dev am: d47e6d84d1" into sc-qpr1-dev am: df4bc3589e am: 52d5d43afc -s ours

am skip reason: Merged-In I2086b29ef9bf3bb6fb7d9ebba6e7b8db9392e459 with SHA-1 efaa814a99 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16517186

Change-Id: I83b61bc7213e24a64810b39f9b41b81f56081058