Merge "Cancel the back animation if the topCallback is removed or the...

Merge "Cancel the back animation if the topCallback is removed or the WindowOnBackInvokedDispatcher is detached from the window." into udc-dev am: b3805c73 am: c0b63d30 am: 872aa888 am: 4980632b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23516257



Change-Id: Ic79ea99e9c465d4793e695cb8dc8d5a695528630
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>