[Chrome OS MD] Draw a 1px separator between 2 tray items

ash/common/shelf/wm_shelf.h

Index: ash/common/shelf/wm_shelf.h
diff --git a/ash/common/shelf/wm_shelf.h b/ash/common/shelf/wm_shelf.h
index de3c15847b9a70316470e675e0de0d4a35dd2f93..b984fd2ba5f6d3e008420a471281e6638a31b1f1 100644
--- a/ash/common/shelf/wm_shelf.h
+++ b/ash/common/shelf/wm_shelf.h
@@ -24,6 +24,7 @@ class Shelf;
 class ShelfLayoutManager;
 class ShelfLockingManager;
 class ShelfView;
+class StatusAreaWidget;
 class WmDimmerView;
 class WmShelfObserver;
 class WmWindow;
@@ -111,6 +112,7 @@ class ASH_EXPORT WmShelf : public ShelfLayoutManagerObserver {
   void RemoveObserver(WmShelfObserver* observer);
 
   void NotifyShelfIconPositionsChanged();
+  StatusAreaWidget* GetStatusAreaWidget() const;
 
   void SetVirtualKeyboardBoundsForTesting(const gfx::Rect& bounds);
   ShelfLockingManager* GetShelfLockingManagerForTesting();