Enable websocket filtering via SubresourceFilter

third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 137 matching lines @@
                 bool wasClean,
                 unsigned short code,
                 const String& reason) override;
   void didReceiveFlowControl(WebSocketHandle*, int64_t quota) override;
   void didStartClosingHandshake(WebSocketHandle*) override;
 
   // Methods for BlobLoader.
   void didFinishLoadingBlob(DOMArrayBuffer*);
   void didFailLoadingBlob(FileError::ErrorCode);
 
+  // This method is run asynchronously after a successful connect() to allow for
+  // additional filtering policy to be applied to this connection.
+  void maybeFilterConnection();
+
   // m_handle is a handle of the connection.
   // m_handle == 0 means this channel is closed.
   std::unique_ptr<WebSocketHandle> m_handle;
 
   // m_client can be deleted while this channel is alive, but this class
   // expects that disconnect() is called before the deletion.
   Member<WebSocketChannelClient> m_client;
   KURL m_url;
   // m_identifier > 0 means calling scriptContextExecution() returns a Document.
   unsigned long m_identifier;
@@ skipping 13 matching lines @@
   RefPtr<WebSocketHandshakeRequest> m_handshakeRequest;
 
   static const uint64_t receivedDataSizeForFlowControlHighWaterMark = 1 << 15;
 };
 
 std::ostream& operator<<(std::ostream&, const DocumentWebSocketChannel*);
 
 }  // namespace blink
 
 #endif  // DocumentWebSocketChannel_h