ash: Make sure the text-label entries in the tray look consistently good.

ash/system/tray/tray_views.cc

Index: ash/system/tray/tray_views.cc
diff --git a/ash/system/tray/tray_views.cc b/ash/system/tray/tray_views.cc
index 9e84c10145bfab8ae0d7b183270af5e08bf2b812..73f856fe27cebdfe9ae99e45d6098ed9b189d42e 100644
--- a/ash/system/tray/tray_views.cc
+++ b/ash/system/tray/tray_views.cc
@@ -85,5 +85,13 @@ void HoverHighlightView::OnMouseExited(const views::MouseEvent& event) {
   SchedulePaint();
 }
 
+void SetupLabelForTray(views::Label* label) {
+  label->SetFont(
+      label->font().DeriveFont(2, gfx::Font::BOLD));
+  label->SetAutoColorReadabilityEnabled(false);
+  label->SetEnabledColor(SK_ColorWHITE);
+  label->SetBackgroundColor(SkColorSetARGB(0, 255, 255, 255));
+}
+
 }  // namespace internal
 }  // namespace ash