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

ash/common/system/chromeos/ime_menu/ime_menu_tray.h

Index: ash/common/system/chromeos/ime_menu/ime_menu_tray.h
diff --git a/ash/common/system/chromeos/ime_menu/ime_menu_tray.h b/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
index 4a0ebffab80edd12bee382457a44ad4750dff98a..3a6710724f5145b291b158569d8ab07fd4b14a66 100644
--- a/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
+++ b/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
@@ -17,12 +17,13 @@ class Label;
 
 namespace ash {
 class StatusAreaWidget;
+class ViewObserver;
 class WmWindow;
 
 // The tray item for IME menu.
 class ASH_EXPORT ImeMenuTray : public TrayBackgroundView, public IMEObserver {
  public:
-  explicit ImeMenuTray(WmShelf* wm_shelf);
+  explicit ImeMenuTray(WmShelf* wm_shelf, ViewObserver* view_observer);
   ~ImeMenuTray() override;
 
   // TrayBackgroundView: