Fix ddc build

pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart

Index: pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart b/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
index 59aa7fff52f5b3f87b5c9250dcef697a5fec4fe3..afd48e5e738b30416267a4a19dd203ca90eaccfb 100644
--- a/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
+++ b/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
@@ -419,7 +419,8 @@ class ServerSocket {
 @patch
 class RawSocket {
   @patch
-  static Future<RawSocket> connect(host, int port, {sourceAddress}) {
+  static Future<RawSocket> connect(host, int port,
+      {sourceAddress, Duration timeout}) {
     throw new UnsupportedError("RawSocket constructor");
   }
 }