Implement window open disposition for (some) navigation buttons....

chrome/browser/gtk/browser_toolbar_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_BROWSER_TOOLBAR_GTK_H_
 #define CHROME_BROWSER_GTK_BROWSER_TOOLBAR_GTK_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 91 matching lines @@
   void AddAcceleratorToButton(
       GtkWidget*, unsigned int accelerator, unsigned int accelerator_mod);
 
   // Gtk callback for the "expose-event" signal.
   static gboolean OnToolbarExpose(GtkWidget* widget, GdkEventExpose* e,
                                   BrowserToolbarGtk* toolbar);
 
   // Gtk callback for the "clicked" signal.
   static void OnButtonClick(GtkWidget* button, BrowserToolbarGtk* toolbar);
 
+  // Gtk callback for the "button-release-event" signal.
+  static gboolean OnButtonRelease(GtkWidget* button, GdkEventButton* event,
+                                  BrowserToolbarGtk* toolbar);
+
   // Gtk callback to intercept mouse clicks to the menu buttons.
   static gboolean OnMenuButtonPressEvent(GtkWidget* button,
                                          GdkEventButton* event,
                                          BrowserToolbarGtk* toolbar);
 
   // Initialize the background NineBox.
   void InitNineBox();
 
   // Ninebox for the toolbar background
   scoped_ptr<NineBox> background_ninebox_;
@@ skipping 22 matching lines @@
   scoped_ptr<MenuGtk> page_menu_;
   scoped_ptr<MenuGtk> app_menu_;
 
   Browser* browser_;
   BrowserWindowGtk* window_;
   Profile* profile_;
 
   // Controls whether or not a home button should be shown on the toolbar.
   BooleanPrefMember show_home_button_;
 
+  // The event state the last time we observed a button release event.
+  int last_release_event_flags_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserToolbarGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_BROWSER_TOOLBAR_GTK_H_