webui: minimize webui flicker.

ui/base/webui/web_ui_util.h

 // Copyright 2013 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_BASE_WEBUI_WEB_UI_UTIL_H_
 #define UI_BASE_WEBUI_WEB_UI_UTIL_H_
 
 #include <string>
 
 #include "base/strings/string_piece.h"
@@ skipping 32 matching lines @@
 // factor then the default scale factor is returned.
 UI_BASE_EXPORT void ParsePathAndScale(const GURL& url,
                                       std::string* path,
                                       float* scale_factor);
 
 // Helper function to set the font family, size, and text direction into the
 // given dictionary.
 UI_BASE_EXPORT void SetFontAndTextDirection(
     base::DictionaryValue* localized_strings);
 
+// Get some common font styles for all of WebUI.
+UI_BASE_EXPORT std::string GetFontFamily();
+UI_BASE_EXPORT std::string GetFontSize();
+UI_BASE_EXPORT std::string GetTextDirection();
+
 }  // namespace webui
 
 #endif  // UI_BASE_WEBUI_WEB_UI_UTIL_H_