Adds ash_mus_unittests to FYI bot

ash/wm/overview/window_selector_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/accessibility_types.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 922 matching lines @@
   if (WmShell::Get()->IsRunningInMash())
     return;
 
   gfx::Rect bounds(0, 0, 400, 400);
   std::unique_ptr<aura::Window> window1(CreateWindow(bounds));
   std::unique_ptr<aura::Window> window2(CreateWindow(bounds));
 
   // The tested behavior relies on the app list presenter delegate.
   test::TestAppListViewPresenterImpl app_list_presenter_impl;
 
-  app_list_presenter_impl.Show(display_manager()->first_display_id());
+  app_list_presenter_impl.Show(
+      display::Screen::GetScreen()->GetPrimaryDisplay().id());
   EXPECT_TRUE(app_list_presenter_impl.IsVisible());
 
   ToggleOverview();
   EXPECT_FALSE(app_list_presenter_impl.IsVisible());
   ToggleOverview();
 }
 
 // Tests that a minimized window's visibility and layer visibility is correctly
 // changed when entering overview and restored when leaving overview mode.
 // Crashes after the skia roll in http://crrev.com/274114.
@@ skipping 899 matching lines @@
                           aura::client::WINDOW_MOVE_SOURCE_MOUSE));
   ASSERT_TRUE(resizer.get());
   gfx::Point location = resizer->GetInitialLocation();
   location.Offset(20, 20);
   resizer->Drag(location, 0);
   ToggleOverview();
   resizer->RevertDrag();
 }
 
 }  // namespace ash