Added timeout parameter to RawSocket and Socket connect, which allows for the specification of a ma…

sdk/lib/_internal/js_runtime/lib/io_patch.dart

Index: sdk/lib/_internal/js_runtime/lib/io_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/io_patch.dart b/sdk/lib/_internal/js_runtime/lib/io_patch.dart
index 59aa7fff52f5b3f87b5c9250dcef697a5fec4fe3..2dabd3123d6ea8ce7f39c9bdce03fca95ca626df 100644
--- a/sdk/lib/_internal/js_runtime/lib/io_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/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");
   }
 }
@@ -427,7 +428,8 @@ class RawSocket {
 @patch
 class Socket {
   @patch
-  static Future<Socket> connect(host, int port, {sourceAddress}) {
+  static Future<Socket> connect(host, int port,
+      {sourceAddress, Duration timeout}) {
     throw new UnsupportedError("Socket constructor");
   }
 }