Make drawDragView protected so it can be used in subclasses.

Bug: 73818519
Bug: 74404893
Change-Id: I75b8cc322bd8d96be83adbfaf2c0244df27019d8
diff --git a/src/com/android/launcher3/graphics/DragPreviewProvider.java b/src/com/android/launcher3/graphics/DragPreviewProvider.java
index e60a2c7..5094280 100644
--- a/src/com/android/launcher3/graphics/DragPreviewProvider.java
+++ b/src/com/android/launcher3/graphics/DragPreviewProvider.java
@@ -76,7 +76,7 @@
     /**
      * Draws the {@link #mView} into the given {@param destCanvas}.
      */
-    private void drawDragView(Canvas destCanvas, float scale) {
+    protected void drawDragView(Canvas destCanvas, float scale) {
         destCanvas.save();
         destCanvas.scale(scale, scale);