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: I3e4988a2d3ab82738397e00f3271e6895bf85933
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>