added CTRL+Click and SHIFT+Click handler for context menu, Back and Forward.

ui/base/models/simple_menu_model.h

Index: ui/base/models/simple_menu_model.h
diff --git a/ui/base/models/simple_menu_model.h b/ui/base/models/simple_menu_model.h
index 59b752fe1ba97f859bd74d7de10f878ea6e0ebda..82f2cad6dec1d71f284687b9926af8bb56fa13d3 100644
--- a/ui/base/models/simple_menu_model.h
+++ b/ui/base/models/simple_menu_model.h
@@ -48,6 +48,7 @@ class SimpleMenuModel : public MenuModel {
 
     // Performs the action associated with the specified command id.
     virtual void ExecuteCommand(int command_id) = 0;
+    virtual void ExecuteCommandWithDisposition(int command_id, int disposition);
 
     // Notifies the delegate that the menu has closed.
     virtual void MenuClosed();
@@ -118,6 +119,7 @@ class SimpleMenuModel : public MenuModel {
   virtual bool IsVisibleAt(int index) const;
   virtual void HighlightChangedTo(int index);
   virtual void ActivatedAt(int index);
+  virtual void ActivatedAtWithDisposition(int index, int disposition);
   virtual MenuModel* GetSubmenuModelAt(int index) const;
   virtual void MenuClosed();
   virtual void SetMenuModelDelegate(ui::MenuModelDelegate* menu_model_delegate);