Initial implementation of Cronet Async API.

components/cronet/android/java/src/org/chromium/net/UrlRequestException.java

 // Copyright 2014 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;
 
 import java.io.IOException;
 
 /**
- *
+ * Exception after UrlRequest start. Could be reported by network stack, in
+ * which case netError() will contain native error code.
  */
 public class UrlRequestException extends IOException {
+    /** Net error code if exception is reported by native. */
+    final int mNetError;
+
+    UrlRequestException(String message, Throwable cause) {
+        super(message, cause);
+        mNetError = 0;
+    }
+
+    UrlRequestException(String message, int netError) {
+        super(message, null);
+        mNetError = netError;
+    }
+
+    /** @return Error code if exception is reported by native. */
+    public int netError() {
+        return mNetError;
+    }
 }