Add getFontList() to Font Settings Extension API.

chrome/browser/extensions/extension_font_settings_api.h

 // Copyright (c) 2012 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_EXTENSIONS_EXTENSION_FONT_SETTINGS_API_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FONT_SETTINGS_API_H__
 #pragma once
 
 #include "chrome/browser/extensions/extension_function.h"
 
 class GetFontNameFunction : public SyncExtensionFunction {
  public:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.fontSettings.getFontName")
 };
 
 class SetFontNameFunction : public SyncExtensionFunction {
  public:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.fontSettings.setFontName")
 };
 
+class GetFontListFunction : public AsyncExtensionFunction {
+ public:
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.fontSettings.getFontList")
+
+ private:
+  void FontListHasLoaded(scoped_ptr<base::ListValue> list);
+  bool CopyFontsToResult(base::ListValue* fonts);
+};
+
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FONT_SETTINGS_API_H__