diff -r 000000000000 -r 6474c204b198 intl/locale/public/nsILanguageAtomService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intl/locale/public/nsILanguageAtomService.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsILanguageAtomService_h_
+#define nsILanguageAtomService_h_
+
+/*
+ * The nsILanguageAtomService provides a mapping from languages or charsets
+ * to language groups, and access to the system locale language.
+ */
+
+#include "nsISupports.h"
+#include "nsCOMPtr.h"
+#include "nsIAtom.h"
+
+#define NS_ILANGUAGEATOMSERVICE_IID \
+  {0xAF4C48CF, 0x8F76, 0x4477, \
+    { 0xA7, 0x0E, 0xAB, 0x09, 0x74, 0xE2, 0x41, 0xF0 }}
+
+#define NS_LANGUAGEATOMSERVICE_CONTRACTID \
+  "@mozilla.org/intl/nslanguageatomservice;1"
+
+class nsILanguageAtomService : public nsISupports
+{
+ public: 
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILANGUAGEATOMSERVICE_IID)
+
+  virtual nsIAtom* LookupLanguage(const nsACString &aLanguage,
+                                  nsresult *aError = nullptr) = 0;
+  virtual already_AddRefed<nsIAtom>
+  LookupCharSet(const char *aCharSet, nsresult *aError = nullptr) = 0;
+
+  virtual nsIAtom* GetLocaleLanguage(nsresult *aError = nullptr) = 0;
+
+  virtual nsIAtom* GetLanguageGroup(nsIAtom *aLanguage,
+                                    nsresult *aError = nullptr) = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsILanguageAtomService,
+                              NS_ILANGUAGEATOMSERVICE_IID)
+
+#endif