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

chrome/browser/ui/cocoa/toolbar/back_forward_menu_controller.mm

 // Copyright (c) 2011 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.
 
 #import "chrome/browser/ui/cocoa/toolbar/back_forward_menu_controller.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/event_utils.h"
@@ skipping 72 matching lines @@
       [menuItem setAction:@selector(executeMenuItem:)];
 
       // Put it in the menu!
       [menu insertItem:menuItem
                atIndex:(menuID + 1)];
     }
   }
 }
 
 // Action methods:
-
 - (void)executeMenuItem:(id)sender {
   DCHECK([sender isKindOfClass:[NSMenuItem class]]);
   int menuID = [sender tag];
-  model_->ActivatedAtWithDisposition(
+  model_->ActivatedAtWithFlags(
       menuID,
-      event_utils::WindowOpenDispositionFromNSEvent([NSApp currentEvent]));
+      event_utils::EventFlagsFromNSEvent([NSApp currentEvent]));
 }
 
 @end  // @implementation BackForwardMenuController