Steps to reproduce the problem:
1. Create a CronetEngine and call enableNetworkQualityEstimator followed by addRequestFinishedListener.
2. Create and send a UrlRequest without a network connection.
3. RequestFinishedListener#onRequestFinished(UrlRequestInfo) will be called, but there is no way to access the UrlRequestException from UrlRequestInfo.

What is the expected behavior?
UrlRequestInfo should contain a UrlRequestException field that is populated if the url request failed with an exception.

What went wrong?
Implementation details:
1) Create a mUrlRequestException field in CronetEngine.UrlRequestInfo with a corresponding getter and a constructor that takes in this parameter https://code.google.com/p/chromium/codesearch#chromium/src/components/cronet/android/api/src/org/chromium/net/CronetEngine.java&l=993
2) Create a mUrlRequestException field in CronetUrlRequest and populated it when creating a UrlRequestException in this class
3) In CronetUrlRequest#getRequestInfo, call the constructor created in 1) to populated UrlRequestException with mUrlRequestException

Did this work before? N/A 

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