Merge "Prevent media button receivers targeting activities" into udc-dev am:...

Merge "Prevent media button receivers targeting activities" into udc-dev am: fe79cdd8 am: 8b3d9dbf am: a7c60486

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24444452



Change-Id: Ia3b914982ab9d4dfa9acd841fb5192552a2cb596
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>