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

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/chromeos/ime_menu/ime_menu_tray.h"
 
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_utils.h"
 #include "ash/common/wm_shell.h"
@@ skipping 17 matching lines @@
     return gfx::Size(kTrayImeIconSize, kTrayImeIconSize);
   }
   int GetHeightForWidth(int width) const override { return kTrayImeIconSize; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ImeMenuLabel);
 };
 
 }  // namespace
 
-ImeMenuTray::ImeMenuTray(WmShelf* wm_shelf)
-    : TrayBackgroundView(wm_shelf), label_(new ImeMenuLabel()) {
+ImeMenuTray::ImeMenuTray(WmShelf* wm_shelf, ViewObserver* view_observer)
+    : TrayBackgroundView(wm_shelf, view_observer), label_(new ImeMenuLabel()) {
   SetupLabelForTray(label_);
   tray_container()->AddChildView(label_);
   SetContentsBackground();
   WmShell::Get()->system_tray_notifier()->AddIMEObserver(this);
 }
 
 ImeMenuTray::~ImeMenuTray() {
   WmShell::Get()->system_tray_notifier()->RemoveIMEObserver(this);
 }
 
@@ skipping 37 matching lines @@
   else
     label_->SetText(current_ime_.short_name);
 }
 
 void ImeMenuTray::SetTrayActivation(bool is_active) {
   SetDrawBackgroundAsActive(is_active);
   // TODO(azurewei): Shows/hides the IME menu tray bubble based on |is_active|.
 }
 
 }  // namespace ash