Use customized RGBA-enabled tooltip window for tooltip on ChroemOS

views/widget/tooltip_manager_gtk.h

Index: views/widget/tooltip_manager_gtk.h
diff --git a/views/widget/tooltip_manager_gtk.h b/views/widget/tooltip_manager_gtk.h
index ca690aba9eec09d1a2acf680ec5afc67e5cee518..d9393432f1fd95e4bfb16356786b7dcf78291063 100644
--- a/views/widget/tooltip_manager_gtk.h
+++ b/views/widget/tooltip_manager_gtk.h
@@ -5,10 +5,11 @@
 #ifndef VIEWS_WIDGET_TOOLTIP_MANAGER_GTK_H_
 #define VIEWS_WIDGET_TOOLTIP_MANAGER_GTK_H_
 
-#include "views/widget/tooltip_manager.h"
-
 #include <gtk/gtk.h>
 
+#include "views/widget/tooltip_manager.h"
+#include "views/widget/tooltip_window_gtk.h"
+
 namespace views {
 
 class WidgetGtk;
@@ -40,6 +41,9 @@ class TooltipManagerGtk : public TooltipManager {
   // The view supplied to the last invocation of ShowKeyboardTooltip.
   View* keyboard_view_;
 
+  // Custimized tooltip window.
+  TooltipWindowGtk tooltip_window_;
+
   DISALLOW_COPY_AND_ASSIGN(TooltipManagerGtk);
 };