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

ash/common/system/chromeos/session/logout_button_tray.h

Index: ash/common/system/chromeos/session/logout_button_tray.h
diff --git a/ash/common/system/chromeos/session/logout_button_tray.h b/ash/common/system/chromeos/session/logout_button_tray.h
index abf5041435edf2d39998faa2eac3c39c6c58f366..9a47d871fcf6d3c94d8081987833258c3be1a0f9 100644
--- a/ash/common/system/chromeos/session/logout_button_tray.h
+++ b/ash/common/system/chromeos/session/logout_button_tray.h
@@ -18,6 +18,8 @@ class LabelButton;
 }
 
 namespace ash {
+class ViewObserver;

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

not needed

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

Done.

+class WmShelfObserver;
 
 // Adds a logout button to the launcher's status area if enabled by the
 // kShowLogoutButtonInTray pref.
@@ -25,7 +27,8 @@ class ASH_EXPORT LogoutButtonTray : public TrayBackgroundView,
                                     public LogoutButtonObserver,
                                     public views::ButtonListener {
  public:
-  explicit LogoutButtonTray(WmShelf* wm_shelf);
+  explicit LogoutButtonTray(WmShelf* wm_shelf,

[varkha, 2016/08/10 23:27:24]

nit: no need for explicit.

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

After changing the observer, there will be only 1 parameter

+                            WmShelfObserver* wm_shelf_observer);
   ~LogoutButtonTray() override;
 
   // TrayBackgroundView: