Merge "Add flag for new download app UI color and contrast update." into tm-qpr-dev am: fd02dce8

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



Change-Id: Iaa327ca4fb8b1cf110131c11126c311861a064f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>