Multiprofile security: Show a warning messagebox when desktop casting/sharing is turned on upon user

ash/system/tray/system_tray.h

Index: ash/system/tray/system_tray.h
diff --git a/ash/system/tray/system_tray.h b/ash/system/tray/system_tray.h
index 2df725daac7d7a614633c59cb7d3afc805a0c9e8..301ef130d95be17130a2372d5fba68a82e1213c9 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -20,6 +20,7 @@
 #include <vector>
 
 namespace ash {
+class ScreenTrayItem;
 class SystemBubbleWrapper;
 class SystemTrayDelegate;
 class SystemTrayItem;
@@ -141,6 +142,9 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
       AnchorAlignment anchor_alignment) const OVERRIDE;
   virtual void HideBubble(const views::TrayBubbleView* bubble_view) OVERRIDE;
 
+  ScreenTrayItem* GetScreenShareItem() { return screen_share_tray_item_; }
+  ScreenTrayItem* GetScreenCaptureItem() { return screen_capture_tray_item_; }
+
   TrayAccessibility* GetTrayAccessibilityForTest() {
     return tray_accessibility_;
   }
@@ -232,6 +236,10 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   TrayAccessibility* tray_accessibility_;  // not owned
   TrayDate* tray_date_;
 
+  // A reference to the Screen share and capture item.
+  ScreenTrayItem* screen_capture_tray_item_;  // not owned
+  ScreenTrayItem* screen_share_tray_item_;  // not owned
+
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };