Materialized font style for TrayItemMore type system tray rows.

ash/common/system/tray/tray_item_more.h

Index: ash/common/system/tray/tray_item_more.h
diff --git a/ash/common/system/tray/tray_item_more.h b/ash/common/system/tray/tray_item_more.h
index 918d3c38fe5b64ecdf80d73af2de2d26589d837b..0459aa569bec71cb30d7428a05efeafec474378e 100644
--- a/ash/common/system/tray/tray_item_more.h
+++ b/ash/common/system/tray/tray_item_more.h
@@ -38,12 +38,19 @@ class TrayItemMore : public ActionableView {
   void ReplaceIcon(views::View* view);
 
  private:
+  // TODO(bruthig): Re-design to inform subclasses when the style changes while
+  // avoiding virtual function calls from the constructor.
+  void UpdateStyle();
+
   // Overridden from ActionableView.
   bool PerformAction(const ui::Event& event) override;
 
   // Overridden from views::View.
   void Layout() override;
   void GetAccessibleState(ui::AXViewState* state) override;
+  void ViewHierarchyChanged(
+      const ViewHierarchyChangedDetails& details) override;
+  void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
 
   SystemTrayItem* owner_;
   // True if |more_| should be shown.