Preventing workspace scroll over QSB area

Bug: 189792966
Test: Manual
Change-Id: Ie2fe8e7fb6c80b9cc19d517fe828cf26f54f6f09
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index 696e897..2f9b5af 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -1046,7 +1046,7 @@
     /**
      * If being flinged and user touches the screen, initiate drag; otherwise don't.
      */
-    private void updateIsBeingDraggedOnTouchDown(MotionEvent ev) {
+    protected void updateIsBeingDraggedOnTouchDown(MotionEvent ev) {
         // mScroller.isFinished should be false when being flinged.
         final int xDist = Math.abs(mScroller.getFinalX() - mScroller.getCurrX());
         final boolean finishedScrolling = (mScroller.isFinished() || xDist < mPageSlop / 3);