Add onWindowDismissed to implementation of Window.Callback.

Bug: 13197024

Change-Id: Ifb0d15daba5cbd6ac9522f5f58256b528eaad2c0
diff --git a/tests/tests/view/src/android/view/cts/WindowTest.java b/tests/tests/view/src/android/view/cts/WindowTest.java
index 7e147ab..afe5f0d 100644
--- a/tests/tests/view/src/android/view/cts/WindowTest.java
+++ b/tests/tests/view/src/android/view/cts/WindowTest.java
@@ -1088,5 +1088,8 @@
 
         public void onActionModeFinished(ActionMode mode) {
         }
+
+        public void onWindowDismissed() {
+        }
     }
 }