Add construction of WebSocketDeflateStream

net/websockets/websocket_basic_handshake_stream.h

Index: net/websockets/websocket_basic_handshake_stream.h
diff --git a/net/websockets/websocket_basic_handshake_stream.h b/net/websockets/websocket_basic_handshake_stream.h
index 6ef57d4e8d0b834c72b5fd88cc29f3302d0277e9..71e835f1d7afd2c1520747a3c443d995af00f811 100644
--- a/net/websockets/websocket_basic_handshake_stream.h
+++ b/net/websockets/websocket_basic_handshake_stream.h
@@ -22,6 +22,8 @@ class HttpResponseHeaders;
 class HttpResponseInfo;
 class HttpStreamParser;
 
+struct WebSocketExtensionParams;
+
 class NET_EXPORT_PRIVATE WebSocketBasicHandshakeStream
     : public WebSocketHandshakeStreamBase {
  public:
@@ -127,6 +129,10 @@ class NET_EXPORT_PRIVATE WebSocketBasicHandshakeStream
   // The extension(s) selected by the server.
   std::string extensions_;
 
+  // The extension parameters. The class is defined in the implementation file
+  // to avoid including extension-related header files here.
+  scoped_ptr<WebSocketExtensionParams> extension_params_;
+
   std::string failure_message_;
 
   DISALLOW_COPY_AND_ASSIGN(WebSocketBasicHandshakeStream);