Implement DraggedTabGtk, the object that handles rendering either a dragged t...

chrome/browser/gtk/tabs/tab_gtk.h

Index: chrome/browser/gtk/tabs/tab_gtk.h
===================================================================
--- chrome/browser/gtk/tabs/tab_gtk.h	(revision 16177)
+++ chrome/browser/gtk/tabs/tab_gtk.h	(working copy)
@@ -80,9 +80,15 @@
 
   // TabRendererGtk overrides:
   virtual bool IsSelected() const;
+  virtual bool IsVisible() const;
+  virtual void SetVisible(bool visible) const;
   virtual void CloseButtonResized(const gfx::Rect& bounds);
   virtual void Paint(GdkEventExpose* event);
 
+  // The callback that is called for every gdk event.  We use it to inspect for
+  // drag-motion events when the drag is outside of the source tab.
+  static void GdkEventHandler(GdkEvent* event, void* tab);
+
   // button-press-event handler that handles mouse clicks.
   static gboolean OnMousePress(GtkWidget* widget, GdkEventButton* event,
                                TabGtk* tab);
@@ -147,6 +153,9 @@
   // The windowless widget used to collect input events for the tab.
   OwnedWidgetGtk event_box_;
 
+  // True if this tab is being dragged.
+  bool dragging_;
+
   DISALLOW_COPY_AND_ASSIGN(TabGtk);
 };