Fleshes out the tooltip implementation for views on Gtk. It doesn't...

views/widget/widget_gtk.h

Index: views/widget/widget_gtk.h
===================================================================
--- views/widget/widget_gtk.h	(revision 25502)
+++ views/widget/widget_gtk.h	(working copy)
@@ -155,6 +155,10 @@
   virtual gboolean OnFocusOut(GtkWidget* widget, GdkEventFocus* event);
   virtual gboolean OnKeyPress(GtkWidget* widget, GdkEventKey* event);
   virtual gboolean OnKeyRelease(GtkWidget* widget, GdkEventKey* event);
+  virtual gboolean OnQueryTooltip(gint x,
+                                  gint y,
+                                  gboolean keyboard_mode,
+                                  GtkTooltip* tooltip);
   virtual gboolean OnScroll(GtkWidget* widget, GdkEventScroll* event) {
     return false;
   }
@@ -258,6 +262,12 @@
   static gboolean CallFocusOut(GtkWidget* widget, GdkEventFocus* event);
   static gboolean CallKeyPress(GtkWidget* widget, GdkEventKey* event);
   static gboolean CallKeyRelease(GtkWidget* widget, GdkEventKey* event);
+  static gboolean CallQueryTooltip(GtkWidget* widget,
+                                   gint x,
+                                   gint y,
+                                   gboolean keyboard_mode,
+                                   GtkTooltip* tooltip,
+                                   WidgetGtk* host);
   static gboolean CallScroll(GtkWidget* widget, GdkEventScroll* event);
   static gboolean CallVisibilityNotify(GtkWidget* widget,
                                        GdkEventVisibility* event);