Fix uber tray to accept focus via tab selection

ash/status_area/status_area_view.cc

Index: ash/status_area/status_area_view.cc
diff --git a/ash/status_area/status_area_view.cc b/ash/status_area/status_area_view.cc
index 7e1478f40dd74701b8d56e57c61a652fed87d2e1..ed262197f6b6a566761a8d6fbc60fade4a5c1dee 100644
--- a/ash/status_area/status_area_view.cc
+++ b/ash/status_area/status_area_view.cc
@@ -8,6 +8,7 @@
 #include "ash/focus_cycler.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
+#include "ash/system/tray/system_tray.h"
 #include "base/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/aura/root_window.h"
@@ -59,7 +60,12 @@ bool StatusAreaView::CanActivate() const {
   // activation when the user is using the keyboard (FocusCycler).
   const FocusCycler* focus_cycler = focus_cycler_for_testing_ ?
       focus_cycler_for_testing_ : Shell::GetInstance()->focus_cycler();
-  return focus_cycler->widget_activating() == GetWidget();
+
+  ash::SystemTray* tray = ash::Shell::GetInstance()->tray();
+  bool manually_activating = tray && tray->is_taking_focus();
+
+  return manually_activating ||
+         focus_cycler->widget_activating() == GetWidget();
 }
 
 void StatusAreaView::DeleteDelegate() {