Invalidate outline on padding update

bug:19113359

Ensures that ViewOutlineProvider#PADDED_BOUNDS is always kept up to
date with the view's padding.

Change-Id: I5e090bd8272e89d6b8b9055dbe95ef3d45333fcb

core/java/android/view/View.java

@@ -16650,6 +16650,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
 
         if (changed) {
             requestLayout();
+            invalidateOutline();
         }
     }