Merge "Set collapsing toolbar background color" into tm-dev am: bed53f07 am: 78933227

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18179823



Change-Id: I5f4884991a779c7a290c27ec2768c28924fec92d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>