Add construction of WebSocketDeflateStream

net/websockets/websocket_handshake_stream_create_helper.cc

Index: net/websockets/websocket_handshake_stream_create_helper.cc
diff --git a/net/websockets/websocket_handshake_stream_create_helper.cc b/net/websockets/websocket_handshake_stream_create_helper.cc
index 8268cda15fbc8493f41c00bfb004f9955408873f..b3ff3e2d92a75696513adc17c89edf2548f5ba42 100644
--- a/net/websockets/websocket_handshake_stream_create_helper.cc
+++ b/net/websockets/websocket_handshake_stream_create_helper.cc
@@ -26,12 +26,17 @@ WebSocketHandshakeStreamBase*
 WebSocketHandshakeStreamCreateHelper::CreateBasicStream(
     scoped_ptr<ClientSocketHandle> connection,
     bool using_proxy) {
+  // The list of supported extensions and parameters is hard-coded.
+  // TODO(ricea): If more extensions are added, consider a more flexible
+  // method.
+  std::vector<std::string> extensions(
+      1, "permessage-deflate; client_max_window_bits");
   return stream_ =
       new WebSocketBasicHandshakeStream(connection.Pass(),
                                         connect_delegate_,
                                         using_proxy,
                                         requested_subprotocols_,
-                                        std::vector<std::string>());
+                                        extensions);
 }
 
 // TODO(ricea): Create a WebSocketSpdyHandshakeStream. crbug.com/323852