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

ash/aura/wm_shelf_aura.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_AURA_WM_SHELF_AURA_H_
 #define ASH_AURA_WM_SHELF_AURA_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/shelf/shelf_icon_observer.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 
 namespace ash {
 
 class Shelf;
 class ShelfLayoutManager;
+class StatusAreaWidget;

[James Cook, 2016/08/11 20:36:54]

nit: not needed (in general, if an interface from which you inherit makes a
reference to a type you don't need to forward declare it yourself)

[yiyix, 2016/08/18 00:42:59]

Done.

 
 // Aura implementation of WmShelf.
 class ASH_EXPORT WmShelfAura : public WmShelf,
                                public ShelfLayoutManagerObserver,
                                public ShelfIconObserver {
  public:
   WmShelfAura();
   ~WmShelfAura() override;
 
   // This object is initialized in multiple steps as the RootWindowController
@@ skipping 26 matching lines @@
   bool IsVisible() const override;
   void UpdateVisibilityState() override;
   ShelfVisibilityState GetVisibilityState() const override;
   gfx::Rect GetIdealBounds() override;
   gfx::Rect GetUserWorkAreaBounds() const override;
   void UpdateIconPositionForWindow(WmWindow* window) override;
   gfx::Rect GetScreenBoundsOfItemIconForWindow(WmWindow* window) override;
   bool ProcessGestureEvent(const ui::GestureEvent& event) override;
   void AddObserver(WmShelfObserver* observer) override;
   void RemoveObserver(WmShelfObserver* observer) override;
+  StatusAreaWidget* GetStatusAreaWidget() override;
   void SetKeyboardBoundsForTesting(const gfx::Rect& bounds) override;
   ShelfLockingManager* GetShelfLockingManagerForTesting() override;
   ShelfView* GetShelfViewForTesting() override;
 
   // ShelfLayoutManagerObserver:
   void WillDeleteShelfLayoutManager() override;
   void OnAutoHideStateChanged(ShelfAutoHideState new_state) override;
   void OnBackgroundUpdated(ShelfBackgroundType background_type,
                            BackgroundAnimatorChangeType change_type) override;
   void WillChangeVisibilityState(ShelfVisibilityState new_state) override;
@@ skipping 11 matching lines @@
 
   // Forwards mouse and gesture events to ShelfLayoutManager for auto-hide.
   std::unique_ptr<AutoHideEventHandler> auto_hide_event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(WmShelfAura);
 };
 
 }  // namespace ash
 
 #endif  // ASH_AURA_WM_SHELF_AURA_H_