Instrument CronetUrlRequestTest#testThrowOrCancelInOnCanceled flaky test

components/cronet/android/api/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 passed to {@link UrlRequest.Callback#onFailed UrlRequest.Callback.onFailed()} when:
@@ skipping 143 matching lines @@
             default:
                 return false;
             case ERROR_NETWORK_CHANGED:
             case ERROR_TIMED_OUT:
             case ERROR_CONNECTION_CLOSED:
             case ERROR_CONNECTION_TIMED_OUT:
             case ERROR_CONNECTION_RESET:
                 return true;
         }
     }
+
+    @Override
+    public String getMessage() {
+        StringBuilder b = new StringBuilder(super.getMessage());
+        b.append(", ErrorCode=").append(mErrorCode);
+        if (mCronetInternalErrorCode != 0) {
+            b.append(", InternalErrorCode=").append(mCronetInternalErrorCode);
+        }
+        b.append(", Retryable=").append(immediatelyRetryable());
+        return b.toString();
+    }
 }