[ios] Adds IsRunningOnIOS11OrLater().

base/ios/ios_util.h

Index: base/ios/ios_util.h
diff --git a/base/ios/ios_util.h b/base/ios/ios_util.h
index caa594dd8174bdcb36d766045a14e32097e97490..2464b1cc15b4f0f0800c22cf5b583bf482b4dedc 100644
--- a/base/ios/ios_util.h
+++ b/base/ios/ios_util.h
@@ -16,6 +16,9 @@ namespace ios {
 // Returns whether the operating system is iOS 10 or later.
 BASE_EXPORT bool IsRunningOnIOS10OrLater();
 
+// Returns whether the operating system is iOS 11 or later.
+BASE_EXPORT bool IsRunningOnIOS11OrLater();
+
 // Returns whether the operating system is at the given version or later.
 BASE_EXPORT bool IsRunningOnOrLater(int32_t major,
                                     int32_t minor,