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

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



Change-Id: Id8e90ef95e3ccdf429ffd36bf63000a065deb503
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>