Merge "Merge "VirtualDisplayTaskEmbedder: Post background color change callback" into rvc-dev am: 5c53f0af am: 0cba355c am: c386e8f1" into rvc-qpr-dev-plus-aosp am: 5f93703a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11726785

Change-Id: I1674dfa338c32e6fca53c7e967485e2b31339f17