Fix staggered animation on right panel home screen

Recently we have added support for multiple panels
on the home screen but the current StaggeredWorkspaceAnim
logic only supports animation for the leftmost panel.

Test: manual
Bug: 183032642
Change-Id: I539e1c1a26292b75801eb3070e22f0fbde1ebc7e
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index 72eff62..65fde86 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -307,7 +307,7 @@
     /**
      * Returns the currently visible pages.
      */
-    protected Iterable<View> getVisiblePages() {
+    public Iterable<View> getVisiblePages() {
         int panelCount = getPanelCount();
         List<View> visiblePages = new ArrayList<>(panelCount);
         for (int i = mCurrentPage; i < mCurrentPage + panelCount; i++) {