ParseFrom<T> for array slice is missing

csharp/src/Google.Protobuf/MessageParser.cs

@@ -208,6 +208,20 @@ namespace Google.Protobuf
             return message;
         }
 
+        /// <summary>
+        /// Parses a message from a byte array slice.
+        /// </summary>
+        /// <param name="data">The byte array containing the message. Must not be null.</param>
+        /// <param name="offset">The offset of the slice to parse.</param>
+        /// <param name="length">The length of the slice to parse.</param>
+        /// <returns>The newly parsed message.</returns>
+        public new T ParseFrom(byte[] data, int offset, int length)
+        {
+            T message = factory();
+            message.MergeFrom(data, offset, length);
+            return message;
+        }
+
         /// <summary>
         /// Parses a message from the given byte string.
         /// </summary>