Add HttpUrlConnection backed implementation of CronetEngine.

components/cronet/android/api/src/org/chromium/net/UrlResponseInfo.java

 // Copyright 2015 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.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
@@ skipping 43 matching lines @@
          * Each list of values for a single header field is in the same order they
          * were received over the wire.
          *
          * @return an unmodifiable map from response-header field names to lists of values
          */
         public Map<String, List<String>> getAsMap() {
             // This is potentially racy...but races will only result in wasted resource.
             if (mHeadersMap != null) {
                 return mHeadersMap;
             }
-            Map<String, List<String>> map =
-                    new TreeMap<String, List<String>>(String.CASE_INSENSITIVE_ORDER);
+            Map<String, List<String>> map = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
             for (Map.Entry<String, String> entry : mAllHeadersList) {
                 List<String> values = new ArrayList<String>();
                 if (map.containsKey(entry.getKey())) {
                     values.addAll(map.get(entry.getKey()));
                 }
                 values.add(entry.getValue());
                 map.put(entry.getKey(), Collections.unmodifiableList(values));
             }
             mHeadersMap = Collections.unmodifiableMap(map);
             return mHeadersMap;
@@ skipping 122 matching lines @@
      * progresses until completion, when {@link UrlRequest.Callback#onSucceeded onSucceeded()},
      * {@link UrlRequest.Callback#onFailed onFailed()}, or
      * {@link UrlRequest.Callback#onCanceled onCanceled()} is called.
      */
     public long getReceivedBytesCount() {
         return mReceivedBytesCount.get();
     }
 
     @Override
     public String toString() {
-        return String.format(Locale.ROOT, "UrlResponseInfo[%s]: urlChain = %s, "
+        return String.format(Locale.ROOT, "UrlResponseInfo@[%s][%s]: urlChain = %s, "
                         + "httpStatus = %d %s, headers = %s, wasCached = %b, "
                         + "negotiatedProtocol = %s, proxyServer= %s, receivedBytesCount = %d",
-                getUrl(), getUrlChain().toString(), getHttpStatusCode(), getHttpStatusText(),
+                // Prevent asserting on the contents of this string
+                Integer.toHexString(System.identityHashCode(this)), getUrl(),
+                getUrlChain().toString(), getHttpStatusCode(), getHttpStatusText(),
                 getAllHeadersAsList().toString(), wasCached(), getNegotiatedProtocol(),
                 getProxyServer(), getReceivedBytesCount());
     }
 
     // Sets mReceivedBytesCount. Must not be called after request completion or cancellation.
     void setReceivedBytesCount(long currentReceivedBytesCount) {
         mReceivedBytesCount.set(currentReceivedBytesCount);
     }
 }