Add toString() to WallpaperDescription

Bug: 376172272
Flag: android.app.live_wallpaper_content_handling
Test: manually tested in log output
Change-Id: Ifa06622814ca65939d5cee2edb2749fab5a6d699
diff --git a/core/java/android/app/wallpaper/WallpaperDescription.java b/core/java/android/app/wallpaper/WallpaperDescription.java
index a13af7f..d7d6262 100644
--- a/core/java/android/app/wallpaper/WallpaperDescription.java
+++ b/core/java/android/app/wallpaper/WallpaperDescription.java
@@ -168,6 +168,12 @@
         return mSampleSize;
     }
 
+    @Override
+    public String toString() {
+        String component = (mComponent != null) ? mComponent.toString() : "{null}";
+        return  component + ":" + mId;
+    }
+
     ////// Comparison overrides
 
     @Override