Merge "Merge "Only run Animation#setBackdropColor on overriden app transition" into tm-dev am: 2b70f83f am: 82f2ee92" into tm-d1-dev-plus-aosp am: 127c3ff9 am: c4ee7ca0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17983851



Change-Id: I2c546b8770d47392f0454b9e9ff6b7a851040e37
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>