Add getDefaultFontSize and setDefaultFontSize to Font Settings Extension API.

chrome/browser/extensions/extension_font_settings_api.h

Index: chrome/browser/extensions/extension_font_settings_api.h
diff --git a/chrome/browser/extensions/extension_font_settings_api.h b/chrome/browser/extensions/extension_font_settings_api.h
index f27e8beb036b35fa99397a5aef880231dc94f76d..49776f2d0c558e4e74c9499431fc9d4b94a448e4 100644
--- a/chrome/browser/extensions/extension_font_settings_api.h
+++ b/chrome/browser/extensions/extension_font_settings_api.h
@@ -30,4 +30,18 @@ class GetFontListFunction : public AsyncExtensionFunction {
   bool CopyFontsToResult(base::ListValue* fonts);
 };
 
+class GetDefaultFontSizeFunction : public SyncExtensionFunction {
+ public:
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME(
+      "experimental.fontSettings.getDefaultFontSize")
+};
+
+class SetDefaultFontSizeFunction : public SyncExtensionFunction {
+ public:
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME(
+      "experimental.fontSettings.setDefaultFontSize")
+};
+
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FONT_SETTINGS_API_H__