Make the minimized home card not overlap activities on Athena

athena/athena.gyp

Index: athena/athena.gyp
diff --git a/athena/athena.gyp b/athena/athena.gyp
index 87a175ab4f4f7c151b920153ea268ec4835c8165..3ead029ebc5c9be918e55e7cf642b70a5312fc15 100644
--- a/athena/athena.gyp
+++ b/athena/athena.gyp
@@ -62,6 +62,7 @@
         'screen/background_controller.cc',
         'screen/background_controller.h',
         'screen/public/screen_manager.h',
+        'screen/public/screen_manager_delegate.h',
         'screen/screen_accelerator_handler.cc',
         'screen/screen_accelerator_handler.h',
         'screen/screen_manager_impl.cc',
@@ -81,6 +82,7 @@
         'wm/title_drag_controller.cc',
         'wm/title_drag_controller.h',
         'wm/window_manager_impl.cc',
+        'wm/window_manager_impl.h',
         'wm/window_overview_mode.cc',
         'wm/window_overview_mode.h',
       ],
@@ -155,6 +157,8 @@
         'test/sample_activity_factory.h',
         'test/test_app_model_builder.cc',
         'test/test_app_model_builder.h',
+        'test/test_screen_manager_delegate.cc',
+        'test/test_screen_manager_delegate.h',
       ],
     },
     {