Merge "Add flag for new download app UI color and contrast update." into tm-qpr-dev am: fd02dce88f am: f97b031e78

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21151952

Change-Id: I0ea89012a34205fc9575817ff938a6a13b71d3c6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>