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diff --git a/app/l10n_util_win.h b/app/l10n_util_win.h
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+// 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 APP_L10N_UTIL_WIN_H_
+#define APP_L10N_UTIL_WIN_H_
+
+#include <windows.h>
+
+namespace l10n_util {
+
+// Returns the locale-dependent extended window styles.
+// This function is used for adding locale-dependent extended window styles
+// (e.g. WS_EX_LAYOUTRTL, WS_EX_RTLREADING, etc.) when creating a window.
+// Callers should OR this value into their extended style value when creating
+// a window.
+int GetExtendedStyles();
+
+// TODO(xji):
+// This is a temporary name, it will eventually replace GetExtendedStyles
+int GetExtendedTooltipStyles();
+
+// Give an HWND, this function sets the WS_EX_LAYOUTRTL extended style for the
+// underlying window. When this style is set, the UI for the window is going to
+// be mirrored. This is generally done for the UI of right-to-left languages
+// such as Hebrew.
+void HWNDSetRTLLayout(HWND hwnd);
+
+// See http://blogs.msdn.com/oldnewthing/archive/2005/09/15/467598.aspx
+// and  http://blogs.msdn.com/oldnewthing/archive/2006/06/26/647365.aspx
+// as to why we need these three functions.
+
+// Return true if the default font (we get from Windows) is not suitable
+// to use in the UI of the current UI (e.g. Malayalam, Bengali). If
+// override_font_family and font_size_scaler are not null, they'll be
+// filled with the font family name and the size scaler.
+bool NeedOverrideDefaultUIFont(std::wstring* override_font_family,
+                               double* font_size_scaler);
+
+// If the default UI font stored in |logfont| is not suitable, its family
+// and size are replaced with those stored in the per-locale resource.
+void AdjustUIFont(LOGFONT* logfont);
+
+// If the font for a given window (pointed to by HWND) is not suitable for the
+// UI in the current UI langauge, its family and size are replaced with those
+// stored in the per-locale resource.
+void AdjustUIFontForWindow(HWND hwnd);
+
+}  // namespace l10n_util
+
+#endif  // APP_L10N_UTIL_WIN_H_