Add a function that can check if a menu item would be fired by a keypress.

chrome/browser/cocoa/nsmenuitem_additions.h

Index: chrome/browser/cocoa/nsmenuitem_additions.h
diff --git a/chrome/browser/cocoa/nsmenuitem_additions.h b/chrome/browser/cocoa/nsmenuitem_additions.h
new file mode 100644
index 0000000000000000000000000000000000000000..2e17674af2eb96dc5bb0a90eb4c415612773cea8
--- /dev/null
+++ b/chrome/browser/cocoa/nsmenuitem_additions.h
@@ -0,0 +1,18 @@
+// 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_COCOA_NSMENUITEM_ADDITIONS_H_
+#define CHROME_BROWSER_COCOA_NSMENUITEM_ADDITIONS_H_
+
+#import <Cocoa/Cocoa.h>
+
+@interface NSMenuItem(ChromeAdditions)
+
+// Returns true exactly if the menu item would fire if it would be put into
+// a menu and then |menu performKeyEquivalent:event| was called.
+- (BOOL)cr_firesForKeyEvent:(NSEvent*)event;
+
+@end
+
+#endif  // CHROME_BROWSER_COCOA_NSMENUITEM_ADDITIONS_H_