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

ash/wm/shelf_layout_manager.cc

Index: ash/wm/shelf_layout_manager.cc
diff --git a/ash/wm/shelf_layout_manager.cc b/ash/wm/shelf_layout_manager.cc
index 46023ccb3abe65758c96947a0196fc13f4deaae8..8064f55c195deeea84c3ba98bc1a98789f7aa5e1 100644
--- a/ash/wm/shelf_layout_manager.cc
+++ b/ash/wm/shelf_layout_manager.cc
@@ -879,8 +879,10 @@ ShelfLayoutManager::AutoHideState ShelfLayoutManager::CalculateAutoHideState(
                            -kNotificationBubbleGapHeight : 0,
                        0);
   }
-  return shelf_region.Contains(gfx::Screen::GetCursorScreenPoint()) ?
-      AUTO_HIDE_SHOWN : AUTO_HIDE_HIDDEN;
+  return shelf_region.Contains(gfx::Screen::GetCursorScreenPoint(
+        ash::Shell::GetRootNativeView())) ?
+        AUTO_HIDE_SHOWN :
+        AUTO_HIDE_HIDDEN;
 }
 
 void ShelfLayoutManager::UpdateHitTestBounds() {