Merge "Load wallpaper bitmap once instead of twice" into sc-dev am: 6d21beab am: aa61cd5d am: 8cd7cc41

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14985019

Change-Id: I179f895ed32c225113dac150baf74f4ec2291e56