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

ash/common/system/chromeos/palette/palette_tray.h

 // 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.
 
 #ifndef ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_BUTTON_TRAY_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_BUTTON_TRAY_H_
 
 #include <map>
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/session/session_state_observer.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/system/chromeos/palette/palette_tool_manager.h"
 #include "ash/common/system/tray/tray_background_view.h"
 #include "base/macros.h"
 
 namespace views {
 class ImageView;
 class Widget;
 }
 
 namespace ash {
 
 class TrayBubbleWrapper;
 class PaletteToolManager;
+class WmShelfObserver;
 
 // The PaletteTray shows the palette in the bottom area of the screen. This
 // class also controls the lifetime for all of the tools available in the
 // palette.
 class ASH_EXPORT PaletteTray : public TrayBackgroundView,
                                public SessionStateObserver,
                                public ShellObserver,
                                public PaletteToolManager::Delegate,
                                public views::TrayBubbleView::Delegate {
  public:
-  explicit PaletteTray(WmShelf* wm_shelf);
+  explicit PaletteTray(WmShelf* wm_shelf, WmShelfObserver* wm_shelf_observer);

[James Cook, 2016/08/09 00:25:17]

ditto

[yiyix, 2016/08/11 01:23:18]

Done.

   ~PaletteTray() override;
 
   // ActionableView:
   bool PerformAction(const ui::Event& event) override;
 
   // SessionStateObserver:
   void SessionStateChanged(SessionStateDelegate::SessionState state) override;
 
   // TrayBackgroundView:
   void ClickedOutsideBubble() override;
@@ skipping 40 matching lines @@
 
   // Weak pointer, will be parented by TrayContainer for its lifetime.
   views::ImageView* icon_;
 
   DISALLOW_COPY_AND_ASSIGN(PaletteTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_BUTTON_TRAY_H_