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

ash/common/system/tray/system_tray.h

Index: ash/common/system/tray/system_tray.h
diff --git a/ash/common/system/tray/system_tray.h b/ash/common/system/tray/system_tray.h
index 6d08cebec4d38cdbad35fa905e98a9b83593320d..dcd9339a1fe1e8b1d37815173f731c5261bbdc38 100644
--- a/ash/common/system/tray/system_tray.h
+++ b/ash/common/system/tray/system_tray.h
@@ -31,6 +31,7 @@ class TrayDate;
 class TrayUpdate;
 class TrayUser;
 class WebNotificationTray;
+class WmShelfObserver;
 
 // There are different methods for creating bubble views.
 enum BubbleCreationType {
@@ -41,7 +42,7 @@ enum BubbleCreationType {
 class ASH_EXPORT SystemTray : public TrayBackgroundView,
                               public views::TrayBubbleView::Delegate {
  public:
-  explicit SystemTray(WmShelf* wm_shelf);
+  explicit SystemTray(WmShelf* wm_shelf, WmShelfObserver* wm_shelf_observer);

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

no explicit

[yiyix, 2016/08/11 01:23:19]

Done.

   ~SystemTray() override;
 
   // Calls TrayBackgroundView::Initialize(), creates the tray items, and
@@ -217,6 +218,10 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
 
   const ScopedVector<SystemTrayItem>& items() const { return items_; }
 
+  // Sets an empty border around the system tray to change user-visible size
+  // of the dark background. Doesn't do anything in MD.

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

nice documentation, esp. noting the MD vs non-MD status

[yiyix, 2016/08/11 01:23:19]

Thank you :D

+  void AdjustStatusTrayBackground();
+
   // Overridden from ActionableView.
   bool PerformAction(const ui::Event& event) override;