Merge "Update TEST_MAPPING" am: 4b59fafa69 am: fff67f58a3 am: e41b29a9d1

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/downcast-rs/+/2004832

Change-Id: I7e00ccb8e4416ba56bc7832ed3864d2adfd60603