Add SetSupportsQuic method to explicitly specify server that supports QUIC.

components/cronet/android/java/src/org/chromium/net/HttpUrlRequest.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;
 import java.nio.ByteBuffer;
 import java.nio.channels.ReadableByteChannel;
 import java.util.List;
@@ skipping 84 matching lines @@
      * Cancel the request in progress.
      */
     void cancel();
 
     /**
      * Returns {@code true} if the request has been canceled.
      */
     boolean isCanceled();
 
     /**
+     * Returns protocol (e.g. "quic/1+spdy/3") negotiated with server.

[mmenke, 2014/09/09 14:53:35]

Maybe add "Returns empty string if no protocol was negotiated, or the protocol
not known."?

Also, what do we return when using SPDY proxies?  What about CONNECT requests
over SPDY/HTTP proxies?

I don't think it's clear that we don't return HTTP versions (I'm assuming we
don't, at least?)

[Charles, 2014/09/09 17:03:56]

Must be called after onResponseStarted?

[mef, 2014/09/10 16:48:18]

Done.

[mef, 2014/09/10 16:48:18]

Done.
I have no idea. :( Ryan, do you?
Done.

+     */
+    String getNegotiatedProtocol();
+
+    /**
      * Returns the entire response as a ByteBuffer.
      */
     ByteBuffer getByteBuffer();
 
     /**
      * Returns the entire response as a byte array.
      */
     byte[] getResponseAsBytes();
 
     /**
@@ skipping 27 matching lines @@
      * HttpUrlConnection.
      */
     Map<String, List<String>> getAllHeaders();
 
     /**
      * Returns the exception that occurred while executing the request of null
      * if the request was successful.
      */
     IOException getException();
 }