mac: Create a static mapping of accelerators in the main menu.

ui/events/keycodes/keyboard_code_conversion_mac.h

 // 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.
 
 #ifndef UI_EVENTS_KEYCODES_KEYBOARD_CODE_CONVERSION_MAC_H_
 #define UI_EVENTS_KEYCODES_KEYBOARD_CODE_CONVERSION_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "ui/events/events_base_export.h"
 #include "ui/events/keycodes/keyboard_codes_posix.h"
 
 namespace ui {
 
 // We use windows virtual keycodes throughout our keyboard event related code,
 // including unit tests. But Mac uses a different set of virtual keycodes.
 // This function converts a windows virtual keycode into Mac's virtual key code
-// and corresponding unicode character. |flags| is the modifiers mask such
-// as NSControlKeyMask, NSShiftKeyMask, etc.
+// and corresponding unicode character. |flags| is the Cocoa modifiers mask
+// such as NSControlKeyMask, NSShiftKeyMask, etc.
 // When success, the corresponding Mac's virtual key code will be returned.
 // The corresponding unicode character will be stored in |character|, and the
 // corresponding unicode character ignoring the modifiers will be stored in
 // |characterIgnoringModifiers|.
 // -1 will be returned if the keycode can't be converted.
 // This function is mainly for simulating keyboard events in unit tests.
 // See |KeyboardCodeFromNSEvent| for reverse conversion.
 EVENTS_BASE_EXPORT int MacKeyCodeForWindowsKeyCode(
     KeyboardCode keycode,
     NSUInteger flags,
     unichar* character,
     unichar* characterIgnoringModifiers);
 
 // This implementation cribbed from:
 //   third_party/WebKit/Source/web/mac/WebInputEventFactory.mm
 // Converts |event| into a |KeyboardCode|.  The mapping is not direct as the Mac
 // has a different notion of key codes.
 EVENTS_BASE_EXPORT KeyboardCode KeyboardCodeFromNSEvent(NSEvent* event);
 
 EVENTS_BASE_EXPORT const char* CodeFromNSEvent(NSEvent* event);
 
 } // namespace ui
 
 #endif  // UI_EVENTS_KEYCODES_KEYBOARD_CODE_CONVERSION_MAC_H_