Add onFontNameChanged event to Font Settings API

chrome/browser/extensions/extension_preference_helpers.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_PREFERENCE_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_HELPERS_H_
 #pragma once
 
 #include <string>
 
+#include "chrome/common/extensions/extension_permission_set.h"
 #include "chrome/browser/extensions/extension_prefs_scope.h"
 
+class Profile;
+
+namespace base {
+class ListValue;
+class DictionaryValue;
+};
+
+
 namespace extension_preference_helpers {
+
 bool StringToScope(const std::string& s, ExtensionPrefsScope* scope);
+
+// Returns a string constant (defined in the API) indicating the level of
+// control this extension has over the specified preference.
+const char* GetLevelOfControl(
+    Profile* profile,
+    const std::string& extension_id,
+    const std::string& browser_pref,
+    bool incognito);
+
+// Dispatches |event_name| to extensions listening to the event and holding
+// |permission|. |args| is passed as arguments to the event listener.  A
+// key-value for the level of control the extension has over |browser_pref| is
+// injected into the first item of |args|, which must be of type
+// DictionaryValue.
+void DispatchEventToExtensions(
+    Profile* profile,
+    const std::string& event_name,
+    base::ListValue* args,
+    ExtensionAPIPermission::ID permission,
+    bool incognito,
+    const std::string& browser_pref);
 }
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_HELPERS_H_