Changes how we detect whether the launcher should be shown when

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 fc2fdc1a3fe1224d84843f4b36c3a0b55ff27707..ce72c926293b64528f0ebb8f6627e5a55dd88541 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -62,6 +62,9 @@ class ASH_EXPORT SystemTray : public views::View,
   // Updates the items when the login status of the system changes.
   void UpdateAfterLoginStatusChange(user::LoginStatus login_status);
 
+  // Returns true if a bubble is currently showing.
+  bool showing_bubble() const { return bubble_ != NULL; }
+
   const ScopedVector<SystemTrayItem>& items() const { return items_; }
 
   // Sets whether the tray paints a background. Default is true, but is set to