[Athena] Fix switching activities by swiping from the right bezel

athena/wm/split_view_controller.h

Index: athena/wm/split_view_controller.h
diff --git a/athena/wm/split_view_controller.h b/athena/wm/split_view_controller.h
index 5e879185c9fc30b22eea790c9fe6b66f462021ee..be96ea3996fffaeffb61ce1752e0e647a006106f 100644
--- a/athena/wm/split_view_controller.h
+++ b/athena/wm/split_view_controller.h
@@ -34,7 +34,9 @@ class ATHENA_EXPORT SplitViewController
   // Activates split-view mode with |left| and |right| windows. If |left| and/or
   // |right| is NULL, then the first window in the window-list (which is neither
   // |left| nor |right|) is selected instead.
-  void ActivateSplitMode(aura::Window* left, aura::Window* right);
+  void ActivateSplitMode(aura::Window* left,
+                         aura::Window* right,
+                         aura::Window* to_activate);
 
   // Resets the internal state to an inactive state.
   void DeactivateSplitMode();