Make the minimized home card not overlap activities on Athena

athena/main/athena_launcher.h

Index: athena/main/athena_launcher.h
diff --git a/athena/main/athena_launcher.h b/athena/main/athena_launcher.h
index 6ea439fcdb5a73d99ac26910c0302a8b52a3df62..a70a524e54eb327ac8b7f0c44451a0286cb19344 100644
--- a/athena/main/athena_launcher.h
+++ b/athena/main/athena_launcher.h
@@ -12,9 +12,11 @@ class Window;
 namespace athena {
 class ActivityFactory;
 class AppModelBuilder;
+class ScreenManagerDelegate;
 
 // Starts/shuts down the athena shell environment.
 void StartAthena(aura::Window* root_window,
+                 ScreenManagerDelegate* screen_manager_delegate,
                  ActivityFactory* activity_factory,
                  AppModelBuilder* app_model_builder);
 void ShutdownAthena();