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diff --git a/base/keyboard_code_conversion_mac.h b/base/keyboard_code_conversion_mac.h
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+// Copyright (c) 2010 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 BASE_KEYBOARD_CODE_CONVERSION_MAC_H_
+#define BASE_KEYBOARD_CODE_CONVERSION_MAC_H_
+
+#import <Cocoa/Cocoa.h>
+#include "basictypes.h"
+#include "base/keyboard_codes_posix.h"
+
+namespace base {
+
+// 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.
+// 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 third_party/WebKit/WebKit/chromium/src/mac/WebInputEventFactory.mm for
+// reverse conversion.
+int MacKeyCodeForWindowsKeyCode(KeyboardCode keycode,
+                                NSUInteger flags,
+                                unichar* character,
+                                unichar* characterIgnoringModifiers);
+
+} // namespace base
+
+#endif  // BASE_KEYBOARD_CODE_CONVERSION_MAC_H_