Add a context menu to the tab strip. It appears when you click in the

chrome/browser/gtk/tabs/tab_strip_gtk.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 #define CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 
 #include <gtk/gtk.h>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gfx/rect.h"
+#include "chrome/browser/gtk/menu_gtk.h"
 #include "chrome/browser/gtk/tabs/tab_gtk.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/common/owned_widget_gtk.h"
 
 class CustomDrawButton;
 class DraggedTabControllerGtk;
 
 class TabStripGtk : public TabStripModelObserver,
-                    public TabGtk::TabDelegate {
+                    public TabGtk::TabDelegate,
+                    public MenuGtk::Delegate {
  public:
   class TabAnimation;
 
   explicit TabStripGtk(TabStripModel* model);
   virtual ~TabStripGtk();
 
   // Initialize and load the TabStrip into a container.
   // TODO(jhawkins): We have to pass in |profile| in order to get a pointer to
   // the theme provider.  In views, all instances of views::View have access to
   // the theme provider.
@@ skipping 84 matching lines @@
   };
 
   // expose-event handler that redraws the tabstrip
   static gboolean OnExpose(GtkWidget* widget, GdkEventExpose* e,
                            TabStripGtk* tabstrip);
 
   // size-allocate handler that gets the new bounds of the tabstrip.
   static void OnSizeAllocate(GtkWidget* widget, GtkAllocation* allocation,
                              TabStripGtk* tabstrip);
 
+  // Event handler for context menu popups.
+  static gboolean OnButtonPress(GtkWidget* widget, GdkEventButton* event,
+                                TabStripGtk* tabstrip);
+
   // Handles the clicked signal from the new tab button.
   static void OnNewTabClicked(GtkWidget* widget, TabStripGtk* tabstrip);
 
   // Renders the tabstrip background.
   void PaintBackground(GdkEventExpose* event);
 
   // Sets the bounds of the tab and moves the tab widget to those bounds.
   void SetTabBounds(TabGtk* tab, const gfx::Rect& bounds);
 
   // Initializes the new tab button.
@@ skipping 36 matching lines @@
   // Layout method and other callers like the DraggedTabController that need
   // stable representations of Tab positions.
   void GenerateIdealBounds();
 
   // Lays out the New Tab button, assuming the right edge of the last Tab on
   // the TabStrip at |last_tab_right|.  |unselected_width| is the width of
   // unselected tabs at the moment this function is called.  The value changes
   // during animations, so we can't use current_unselected_width_.
   void LayoutNewTabButton(double last_tab_right, double unselected_width);
 
+  // -- Context Menu -----------------------------------------------------------
+
+  // On Windows, right clicking in the tab strip background brings up the
+  // system menu.  There's no such thing on linux, so we just show the menu
+  // items we add to the menu.
+  void ShowContextMenu();
+  // MenuGtk::Delegate implementation:
+  virtual bool IsCommandEnabled(int command_id) const;
+  virtual void ExecuteCommand(int command_id);
+
   // -- Animations -------------------------------------------------------------
 
   // A generic Layout method for various classes of TabStrip animations,
   // including Insert, Remove and Resize Layout cases.
   void AnimationLayout(double unselected_width);
 
   // Starts various types of TabStrip animations.
   void StartInsertTabAnimation(int index);
   void StartRemoveTabAnimation(int index, TabContents* contents);
   void StartResizeLayoutAnimation();
@@ skipping 48 matching lines @@
   // The currently running animation.
   scoped_ptr<TabAnimation> active_animation_;
 
   // The New Tab button.
   scoped_ptr<CustomDrawButton> newtab_button_;
 
   // The controller for a drag initiated from a Tab. Valid for the lifetime of
   // the drag session.
   scoped_ptr<DraggedTabControllerGtk> drag_controller_;
 
+  // The context menu.
+  scoped_ptr<MenuGtk> context_menu_;
+
   DISALLOW_COPY_AND_ASSIGN(TabStripGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_