Initial implementation of CronetBidirectionalStream.

components/cronet/android/api/src/org/chromium/net/CronetException.java

 // Copyright 2015 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.
 
 package org.chromium.net;
 
 /**
  * Exception reported from UrlRequest or BidirectionalStream.
  */
 // TODO(mef): Will replace UrlRequestException soon.
 public class CronetException extends UrlRequestException {
     CronetException(String message, Throwable cause) {
         super(message, cause);
     }
 
     CronetException(String message, int netError) {
-        super(message, null);
+        super(message, netError);
     }
 }