GTK: Implement popup favicon menu.

chrome/browser/gtk/browser_titlebar.h

Index: chrome/browser/gtk/browser_titlebar.h
===================================================================
--- chrome/browser/gtk/browser_titlebar.h	(revision 27516)
+++ chrome/browser/gtk/browser_titlebar.h	(working copy)
@@ -95,6 +95,9 @@
   // change in the window.
   void UpdateTextColor();
 
+  // Show the menu that the user gets from left-clicking the favicon.
+  void ShowFaviconMenu(GdkEventButton* event);
+
   // Callback for changes to window state.  This includes
   // maximizing/restoring/minimizing the window.
   static gboolean OnWindowStateChanged(GtkWindow* window,
@@ -108,6 +111,10 @@
   // Callback for min/max/close buttons.
   static void OnButtonClicked(GtkWidget* button, BrowserTitlebar* window);
 
+  // Callback for favicon.
+  static gboolean OnButtonPressed(GtkWidget* widget, GdkEventButton* event,
+                                  BrowserTitlebar* titlebar);
+
   // -- Context Menu -----------------------------------------------------------
 
   // MenuGtk::Delegate implementation:
@@ -166,6 +173,9 @@
   // The context menu.
   scoped_ptr<MenuGtk> context_menu_;
 
+  // The favicon menu.
+  scoped_ptr<MenuGtk> favicon_menu_;
+
   // The throbber used when the window is in app mode or popup window mode.
   Throbber throbber_;