Adding utility method to test the version of the OS.

base/sys_info.h

Index: base/sys_info.h
diff --git a/base/sys_info.h b/base/sys_info.h
index e155285f3e2b0ac2165f99819229231117eb2dd6..92038feb7fe3f8cc6817072021ba57f9e1e1a114 100644
--- a/base/sys_info.h
+++ b/base/sys_info.h
@@ -100,6 +100,17 @@ class BASE_EXPORT SysInfo {
 
   static int DalvikHeapSizeMB();
 #endif  // defined(OS_ANDROID)
+
+#if defined(OS_IOS)
+  // Running on iOS 5 or later?
+  static bool IsRunningOnIOS5OrLater();
+
+  // Running on iOS 6 or later?
+  static bool IsRunningOnIOS6OrLater();
+
+  // Running on a specific iOS version or later.
+  static bool IsRunningOnOrLater(int major, int minor, int bugFix);
+#endif  // defined(OS_IOS)
 };
 
 }  // namespace base