Merge "[Unfold transition] Fully manage the vignette on the background thread"...

Merge "[Unfold transition] Fully manage the vignette on the background thread" into tm-qpr-dev am: c514109b am: 1d4d3eb5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20725066



Change-Id: I4de4d168c2f70a9f9fd254d617f42944e6564c51
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>