Add context to gfx::Screen calls in support of simultaneous desktop+ash

ash/wm/window_animations.cc

Index: ash/wm/window_animations.cc
diff --git a/ash/wm/window_animations.cc b/ash/wm/window_animations.cc
index 96ecddc2a808f17f752d75422e44f35ceb5b47b9..abf1c40a84366dd15564bd56e4ee154d6767ea57 100644
--- a/ash/wm/window_animations.cc
+++ b/ash/wm/window_animations.cc
@@ -398,7 +398,7 @@ gfx::Rect GetMinimizeRectForWindow(aura::Window* window) {
     // Assume the launcher is overflowed, zoom off to the bottom right of the
     // work area.
     gfx::Rect work_area =
-        gfx::Screen::GetDisplayNearestWindow(window).work_area();
+        Shell::GetAshScreen()->GetDisplayNearestWindow(window).work_area();
     target_bounds.SetRect(work_area.right(), work_area.bottom(), 0, 0);
   }
   target_bounds =