Add option to HttpClient to turn of auto uncompression

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 b995137bb259b65c2fcf5a4bae56205a2c36ad56..896b1e4cff37e026a3515f9f3803263fe510bfed 100644
--- a/sdk/lib/io/http.dart
+++ b/sdk/lib/io/http.dart
@@ -1237,6 +1237,34 @@ abstract class HttpClient {
   int maxConnectionsPerHost;
 
   /**
+   * Get and set whether the body of a response will be automatically
+   * uncompressed.
+   *
+   * The body of an HTTP response can be compressed. In most
+   * situations providing the un-compressed body is most
+   * convenient. Therefore the default behavior is to un-compress the
+   * body. However in some situations (e.g. implementing a transparent
+   * proxy) keeping the uncompressed stream is required.
+   *
+   * NOTE: Headers in from the response is never modified. This means
+   * that when automatic un-compression is turned on the value of the
+   * header `Content-Length` will reflect the length of the original
+   * compressed body. Likewise the header `Content-Encoding` will also
+   * have the original value indicating compression.
+   *
+   * NOTE: Automatic un-compression is only performed if the
+   * `Content-Encoding` header value is `gzip`.
+   *
+   * This value affects all responses produced by this client after the
+   * value is changed.
+   *
+   * To disable, set to `false`.
+   *
+   * Default is `true`.
+   */
+  bool autoUncompress;
+
+  /**
    * Set and get the default value of the `User-Agent` header for all requests
    * generated by this [HttpClient]. The default value is
    * `Dart/<version> (dart:io)`.