Loading
Have DisplayContent be the call point for adjusting wallpaper windows
4th step in trying to make the WindowList private to DisplayContent Have the rest of the system call DisplayContent when they need to adjust the position of the wallpaper windows in the window list instead of calling WallpaperController directly. That way the display content can control the window list that the wallpaper controller sees. Test: Existing tests pass and manual testing. Change-Id: Iaa7f421d7cd24d36e5a83e091f77b4a08d0ae123