Merge "Set collapsing toolbar background color" into tm-dev am: bed53f07 am: c88755c7

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



Change-Id: I335cac715de284d8b2578e08be2c869c988f0ba5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>