Adding utility method to test the version of the OS.

base/ios/ios_util.h

+// Copyright 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 BASE_IOS_IOS_UTIL_H_
+#define BASE_IOS_IOS_UTIL_H_
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+
+namespace base {
+namespace ios {
+
+// Returns whether the operation system is iOS 5 or later.
+BASE_EXPORT bool IsRunningOnIOS5OrLater();
+
+// Returns whether the operation system is iOS 6 or later.
+BASE_EXPORT bool IsRunningOnIOS6OrLater();
+
+// Returns whether the operation system is at the given version or later.
+BASE_EXPORT bool IsRunningOnOrLater(int32 major, int32 minor, int32 bug_fix);
+
+}  // namespace ios
+}  // namespace base
+
+#endif  // BASE_IOS_IOS_UTIL_H_