athena: Fix overview mode for split-view mode.

athena/wm/window_overview_mode.h

Index: athena/wm/window_overview_mode.h
diff --git a/athena/wm/window_overview_mode.h b/athena/wm/window_overview_mode.h
index 157b525aa6e2704fa6117012359f8b7525d07aed..6597fea433d8c170164bc1fce6193579c6e83955 100644
--- a/athena/wm/window_overview_mode.h
+++ b/athena/wm/window_overview_mode.h
@@ -9,6 +9,7 @@
 #include "ui/aura/window.h"
 
 namespace athena {
+class SplitViewController;
 class WindowListProvider;
 
 class WindowOverviewModeDelegate {
@@ -31,6 +32,7 @@ class WindowOverviewMode {
   static scoped_ptr<WindowOverviewMode> Create(
       aura::Window* container,
       const WindowListProvider* window_list_provider,
+      SplitViewController* split_view_controller,
       WindowOverviewModeDelegate* delegate);
 };