[Cronet] Allow UrlRequest bypass cache

components/cronet/android/java/src/org/chromium/net/urlconnection/CronetHttpURLConnection.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.urlconnection;
 
 import android.util.Pair;
 
 import org.chromium.net.ExtendedResponseInfo;
 import org.chromium.net.ResponseInfo;
@@ skipping 53 matching lines @@
     @Override
     public void connect() throws IOException {
         if (connected) {
             checkHasResponse();
             return;
         }
         connected = true;
         for (Pair<String, String> requestHeader : mRequestHeaders) {
             mRequest.addHeader(requestHeader.first, requestHeader.second);
         }
+        if (!getUseCaches()) {

[mmenke, 2015/01/22 16:21:20]

Can you add a test for this, ideally one that compares us with the platform
implementation.

[xunjieli, 2015/01/26 21:36:09]

Partially done. It looks like the default implementation does not cache the
result. See my test in CronetHttpURLConnectTest for more details.

+            mRequest.bypassCache();
+        }
         mRequest.start();
         // Blocks until onResponseStarted or onFailed is called.
         mMessageLoop.loop();
         checkHasResponse();
     }
 
     /**
      * Releases this connection so that its resources may be either reused or
      * closed.
      */
@@ skipping 254 matching lines @@
      */
     private void checkHasResponse() throws IOException {
         if (mException != null) {
             throw mException;
         } else if (mResponseInfo == null) {
             throw new NullPointerException(
                     "Response info is null when there is no exception.");
         }
     }
 }