Accessibility for split-screen divider

- Add label
- Add actions

Bug: 27274494
Bug: 26894949
Change-Id: I041c44f793f1ec86ec27951cc8e87868148b527d
diff --git a/packages/SystemUI/res/values/ids.xml b/packages/SystemUI/res/values/ids.xml
index 87aedab..54d271a 100644
--- a/packages/SystemUI/res/values/ids.xml
+++ b/packages/SystemUI/res/values/ids.xml
@@ -56,5 +56,11 @@
     <item type="id" name="image_icon_tag" />
     <item type="id" name="contains_transformed_view" />
     <item type="id" name="is_clicked_heads_up_tag" />
+
+    <!-- Accessibility actions for the docked stack divider -->
+    <item type="id" name="action_move_left" />
+    <item type="id" name="action_move_right" />
+    <item type="id" name="action_move_up" />
+    <item type="id" name="action_move_down" />
 </resources>