Add Data Saver support to Cronet

components/cronet/android/java/src/org/chromium/net/ResponseInfo.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 android.util.Pair;
 
 import java.util.List;
 import java.util.Map;
@@ skipping 50 matching lines @@
     boolean wasCached();
 
     /**
      * @return protocol (e.g. "quic/1+spdy/3") negotiated with server. Returns
      * empty string if no protocol was negotiated, or the protocol is not known.
      * Returns empty when using plain http or https.
      * TODO(mef): Figure out what this returns in the cached case, both with
      * and without a revalidation request.
      */
     String getNegotiatedProtocol();
+
+    /**
+     * @return the proxy server that was used for the request.
+     */
+    String getProxyServer();
 };