Implementaion for showing recently closed tabs list on right clicking new tab button.

chrome/browser/ui/gtk/tabs/tab_strip_gtk.h

Index: chrome/browser/ui/gtk/tabs/tab_strip_gtk.h
===================================================================
--- chrome/browser/ui/gtk/tabs/tab_strip_gtk.h	(revision 141203)
+++ chrome/browser/ui/gtk/tabs/tab_strip_gtk.h	(working copy)
@@ -13,6 +13,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
+#include "chrome/browser/ui/gtk/menu_gtk.h"
 #include "chrome/browser/ui/gtk/tabs/tab_gtk.h"
 #include "chrome/browser/ui/gtk/tabstrip_origin_provider.h"
 #include "chrome/browser/ui/gtk/view_id_util.h"
@@ -28,6 +29,7 @@
 class CustomDrawButton;
 class DraggedTabControllerGtk;
 class GtkThemeService;
+class RecentlyClosedTabsMenuModel;
 
 namespace gfx {
 class Image;
@@ -38,7 +40,8 @@
                     public MessageLoopForUI::Observer,
                     public content::NotificationObserver,
                     public TabstripOriginProvider,
-                    public ViewIDUtil::Delegate {
+                    public ViewIDUtil::Delegate,
+                    public MenuGtk::Delegate {
  public:
   class TabAnimation;
 
@@ -107,6 +110,8 @@
   // ViewIDUtil::Delegate implementation ---------------------------------------
   virtual GtkWidget* GetWidgetForViewID(ViewID id) OVERRIDE;
 
+  virtual bool AlwaysShowIconForCmd(int command_id) const OVERRIDE;
+
  protected:
   // TabStripModelObserver implementation:
   virtual void TabInsertedAt(TabContentsWrapper* contents,
@@ -273,6 +278,10 @@
                        GdkDragContext*, gint, gint, GtkSelectionData*,
                        guint, guint);
 
+  // Starts a timer to show the dropdown menu.
+  CHROMEGTK_CALLBACK_1(TabStripGtk, gboolean, OnButtonPress,
+                       GdkEventButton*);
+
   // Handles the clicked signal from the new tab button.
   CHROMEGTK_CALLBACK_0(TabStripGtk, void, OnNewTabClicked);
 
@@ -423,6 +432,10 @@
   // Optionally a full Layout will be performed, specified by |layout|.
   void FinishAnimation(TabAnimation* animation, bool layout);
 
+  // Shows the dropdown menu.
+  void ShowRecentlyClosedTabsMenu(GtkWidget* widget,
+                                  int button, guint32 event_time);
+
   // The Tabs we contain, and their last generated "good" bounds.
   std::vector<TabData> tab_data_;
 
@@ -496,6 +509,12 @@
 
   content::NotificationRegistrar registrar_;
 
+  // The dropdown menu model.
+  scoped_ptr<RecentlyClosedTabsMenuModel> menu_model_;
+
+  // The menu gets reset every time it is shown.
+  scoped_ptr<MenuGtk> menu_;
+
   DISALLOW_COPY_AND_ASSIGN(TabStripGtk);
 };