Add option to HttpClient to turn of auto uncompression

sdk/lib/io/http_impl.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 const int _OUTGOING_BUFFER_SIZE = 8 * 1024;
 
 class _HttpIncoming extends Stream<List<int>> {
   final int _transferLength;
@@ skipping 252 matching lines @@
                                         void onDone(),
                                         bool cancelOnError}) {
     if (_incoming.upgraded) {
       // If upgraded, the connection is already 'removed' form the client.
       // Since listening to upgraded data is 'bogus', simply close and
       // return empty stream subscription.
       _httpRequest._httpClientConnection.destroy();
       return new Stream.fromIterable([]).listen(null, onDone: onDone);
     }
     var stream = _incoming;
-    if (headers.value(HttpHeaders.CONTENT_ENCODING) == "gzip") {
+    if (_httpClient.autoUncompress &&
+        headers.value(HttpHeaders.CONTENT_ENCODING) == "gzip") {
       stream = stream.transform(GZIP.decoder);
     }
     return stream.listen(onData,
                          onError: onError,
                          onDone: onDone,
                          cancelOnError: cancelOnError);
   }
 
   Future<Socket> detachSocket() {
     _httpClient._connectionClosed(_httpRequest._httpClientConnection);
@@ skipping 1359 matching lines @@
   Function _findProxy = HttpClient.findProxyFromEnvironment;
   Duration _idleTimeout = const Duration(seconds: 15);
   Function _badCertificateCallback;
 
   Timer _noActiveTimer;
 
   Duration get idleTimeout => _idleTimeout;
 
   int maxConnectionsPerHost;
 
+  bool autoUncompress = true;
+
   String userAgent = _getHttpVersion();
 
   void set idleTimeout(Duration timeout) {
     _idleTimeout = timeout;
     for (var c in _connectionTargets.values) {
       for (var idle in c.idle) {
         // Reset timer. This is fine, as it's not happening often.
         idle.stopTimer();
         idle.startTimer();
       }
@@ skipping 1135 matching lines @@
   const _RedirectInfo(this.statusCode, this.method, this.location);
 }
 
 String _getHttpVersion() {
   var version = Platform.version;
   // Only include major and minor version numbers.
   int index = version.indexOf('.', version.indexOf('.') + 1);
   version = version.substring(0, index);
   return 'Dart/$version (dart:io)';
 }