Merge "[Media TTT] Use the cast icon as a fallback if we can't get the app...

Merge "[Media TTT] Use the cast icon as a fallback if we can't get the app icon for some reason." into tm-dev am: 3a6360c1 am: 8590bdea

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17197947

Change-Id: Ia1d461ac98992bda5ca383750839ff86ecf1ecff