Update TrayPopupHeaderButton Visual Feedback

ash/system/tray/special_popup_row.h

Index: ash/system/tray/special_popup_row.h
diff --git a/ash/system/tray/special_popup_row.h b/ash/system/tray/special_popup_row.h
index 38715ba5e1fd143c4f83d1f4ecc61beb1cad5469..f287f3d5f7af0503b42b30641fdaa0fa0f56d134 100644
--- a/ash/system/tray/special_popup_row.h
+++ b/ash/system/tray/special_popup_row.h
@@ -5,6 +5,7 @@
 #ifndef ASH_SYSTEM_TRAY_SPECIAL_POPUP_ROW_H_
 #define ASH_SYSTEM_TRAY_SPECIAL_POPUP_ROW_H_
 
+#include "ash/ash_export.h"
 #include "ui/gfx/size.h"
 #include "ui/views/view.h"
 
@@ -20,7 +21,7 @@ class ViewClickListener;
 
 // The 'special' looking row in the uber-tray popups. This is usually the bottom
 // row in the popups, and has a fixed height.
-class SpecialPopupRow : public views::View {
+class ASH_EXPORT SpecialPopupRow : public views::View {
  public:
   SpecialPopupRow();
   ~SpecialPopupRow() override;