Reintroduce WCG drawing if supported

As introduced in ag/9752181 for the GLEngine of ImageWallpaper, the CanvasEngine now checks for WallpaperManager#wallpaperSupportsWcg and draw in WCG mode if this returns true.

Test: manual
Bug: 243402530
Change-Id: Icaa06d9cacf39471b9021b3603908771170acfa9
1 file changed