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

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

Index: ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
diff --git a/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc b/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
index 5b9cd38b88a8bb2f1deb7240b993a381c04807e3..c6aca1abb5c29670e8e83a3bb5c5c7ce2788249f 100644
--- a/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
+++ b/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
@@ -5,6 +5,7 @@
 #include "ash/common/system/chromeos/ime_menu/ime_menu_tray.h"
 
 #include "ash/common/session/session_state_delegate.h"
+#include "ash/common/shelf/wm_shelf_observer.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/chromeos/ime_menu/ime_list_view.h"
@@ -137,8 +138,9 @@ class ImeButtonsView : public views::View, public views::ButtonListener {
 
 }  // namespace
 
-ImeMenuTray::ImeMenuTray(WmShelf* wm_shelf)
-    : TrayBackgroundView(wm_shelf), label_(new ImeMenuLabel()) {
+ImeMenuTray::ImeMenuTray(WmShelf* wm_shelf, WmShelfObserver* wm_shelf_observer)
+    : TrayBackgroundView(wm_shelf, wm_shelf_observer),
+      label_(new ImeMenuLabel()) {
   SetupLabelForTray(label_);
   tray_container()->AddChildView(label_);
   SetContentsBackground();