Call close for AbstractFloatingViews that were removed while still open.

I'm not sure how/when this case occurs (perhaps during some transition/state
change), but manually removing the floating view matches the symptoms in the
bug.

Bug: 72996404
Change-Id: I1e7c1a338fcd16c8e07b3c49fb9c9b2097eb2708
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 98440ff..006dc95 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -103,6 +103,8 @@
     public static final boolean ATLEAST_LOLLIPOP_MR1 =
             Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1;
 
+    public static final int SINGLE_FRAME_MS = 16;
+
     /**
      * Indicates if the device has a debug build. Should only be used to store additional info or
      * add extra logging and not for changing the app behavior.