Prevent WallpaperManager#getBitmap return recycled bitmap.

The returned bitmap object could be recycled from client, check
isRecycled and re-create a new bitmap object if needed.

Bug: 176573309
Test: atest WallpaperManagerTests
Change-Id: I71d99d21836b73c93979685f3f7a6f49ba0df3e4

core/java/android/app/WallpaperManager.java

@@ -562,7 +562,7 @@ public class WallpaperManager {
             }
             if (returnDefault) {
                 Bitmap defaultWallpaper = mDefaultWallpaper;
-                if (defaultWallpaper == null) {
+                if (defaultWallpaper == null || defaultWallpaper.isRecycled()) {
                     defaultWallpaper = getDefaultWallpaper(context, which);
                     synchronized (this) {
                         mDefaultWallpaper = defaultWallpaper;