Set App context from WallpaperChanged receiver. (Bug 12525684)

Change-Id: Ie037d74d31e6b05b0ae5bb25ed1bf1c639a28a5f
diff --git a/src/com/android/launcher3/WallpaperChangedReceiver.java b/src/com/android/launcher3/WallpaperChangedReceiver.java
index 28e41d8..2d5612f 100644
--- a/src/com/android/launcher3/WallpaperChangedReceiver.java
+++ b/src/com/android/launcher3/WallpaperChangedReceiver.java
@@ -22,6 +22,7 @@
 
 public class WallpaperChangedReceiver extends BroadcastReceiver {
     public void onReceive(Context context, Intent data) {
+        LauncherAppState.setApplicationContext(context.getApplicationContext());
         LauncherAppState appState = LauncherAppState.getInstance();
         appState.onWallpaperChanged();
     }