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

sdk/lib/io/http.dart

Index: sdk/lib/io/http.dart
diff --git a/sdk/lib/io/http.dart b/sdk/lib/io/http.dart
index f0c4282a228cd635f03d1ffa32a6f99872271c64..d908338bc7a0ebc8776b3d93f4377b13b46f04eb 100644
--- a/sdk/lib/io/http.dart
+++ b/sdk/lib/io/http.dart
@@ -178,6 +178,18 @@ abstract class HttpServer implements Stream<HttpRequest> {
    */
   HttpHeaders get defaultResponseHeaders;
 
+   /**
+   * Whether the [HttpServer] should compress the content, if possible.
+   *
+   * The content can only be compressed when the response is using
+   * chunked Transfer-Encoding and the incoming request has `gzip`
+   * as an accepted encoding in the Accept-Encoding header.
+   *
+   * The default value is `false` (compression disabled).

[Lasse Reichstein Nielsen, 2014/09/23 10:39:59]

You change the default to false. Is this different from the previous behavior if
you don't do anything? If so, it should be a major-version update, not minor.

[Anders Johnsen, 2014/09/23 11:08:04]

This is transparent to the sdk change, so a minor should be fine. (the SDK
restriction should be updated though.)

+   * To enable, set `autoCompress` to `true`.
+   */
+  bool autoCompress;
+
   /**
    * Get or set the timeout used for idle keep-alive connections. If no further
    * request is seen within [idleTimeout] after the previous request was