Add HttpServer:autoCompress option, to disable auto gzip compression.

tests/standalone/io/http_compression_test.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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import 'package:expect/expect.dart';
 import 'dart:io';
 import 'dart:typed_data';
 
 void testServerCompress({bool clientAutoUncompress: true}) {
   void test(List<int> data) {
     HttpServer.bind("127.0.0.1", 0).then((server) {
+      server.autoCompress = true;
       server.listen((request) {
         request.response.add(data);
         request.response.close();
       });
       var client = new HttpClient();
       client.autoUncompress = clientAutoUncompress;
       client.get("127.0.0.1", server.port, "/")
           .then((request) {
             request.headers.set(HttpHeaders.ACCEPT_ENCODING, "gzip,deflate");
             return request.close();
@@ skipping 21 matching lines @@
   var longBuffer = new Uint8List(1024 * 1024);
   for (int i = 0; i < longBuffer.length; i++) {
     longBuffer[i] = i & 0xFF;
   }
   test(longBuffer);
 }
 
 void testAcceptEncodingHeader() {
   void test(String encoding, bool valid) {
     HttpServer.bind("127.0.0.1", 0).then((server) {
+      server.autoCompress = true;
       server.listen((request) {
         request.response.write("data");
         request.response.close();
       });
       var client = new HttpClient();
       client.get("127.0.0.1", server.port, "/")
           .then((request) {
             request.headers.set(HttpHeaders.ACCEPT_ENCODING, encoding);
             return request.close();
           })
@@ skipping 17 matching lines @@
   test('gzip  ,  deflate', true);
   test('deflate,gzip', true);
   test('deflate, gzip', true);
   test('deflate ,gzip', true);
   test('deflate  ,  gzip', true);
   test('abc,deflate  ,  gzip,def,,,ghi  ,jkl', true);
   test('xgzip', false);
   test('gzipx;', false);
 }
 
+void testDisableCompressTest() {
+  HttpServer.bind("127.0.0.1", 0).then((server) {
+    Expect.equals(false, server.autoCompress);
+    server.listen((request) {
+      Expect.equals('gzip', request.headers.value(HttpHeaders.ACCEPT_ENCODING));
+      request.response.write("data");
+      request.response.close();
+    });
+    var client = new HttpClient();
+    client.get("127.0.0.1", server.port, "/")
+        .then((request) => request.close())
+        .then((response) {
+          Expect.equals(null,
+                        response.headers.value(HttpHeaders.CONTENT_ENCODING));
+          response.listen(
+              (_) {},
+              onDone: () {
+                server.close();
+                client.close();
+              });
+        });
+  });
+}
+
 void main() {
   testServerCompress();
   testServerCompress(clientAutoUncompress: false);
   testAcceptEncodingHeader();
+  testDisableCompressTest();
 }