Introduce RequestWebSocketStream into HttpStreamFactory

net/websockets/websocket_stream.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_WEBSOCKETS_WEBSOCKET_STREAM_H_
 #define NET_WEBSOCKETS_WEBSOCKET_STREAM_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_vector.h"
 #include "net/base/completion_callback.h"
+#include "net/websockets/websocket_stream_base.h"
 
 namespace net {
 
 class BoundNetLog;
 class HttpRequestHeaders;
 struct HttpRequestInfo;
 class HttpResponseInfo;
 struct WebSocketFrameChunk;
 
 // WebSocketStream is a transport-agnostic interface for reading and writing
 // WebSocket frames. This class provides an abstraction for WebSocket streams
 // based on various transport layer, such as normal WebSocket connections
 // (WebSocket protocol upgraded from HTTP handshake), SPDY transports, or
 // WebSocket connections with multiplexing extension. Subtypes of
 // WebSocketStream are responsible for managing the underlying transport
 // appropriately.
 //
 // All functions except Close() can be asynchronous. If an operation cannot
 // be finished synchronously, the function returns ERR_IO_PENDING, and
 // |callback| will be called when the operation is finished. Non-null |callback|
 // must be provided to these functions.
 
-class WebSocketStream {
+class WebSocketStream : public WebSocketStreamBase {
  public:
   WebSocketStream() {}
 
   // Derived classes must make sure Close() is called when the stream is not
   // closed on destruction.
   virtual ~WebSocketStream() {}
 
   // Initializes stream. Must be called before calling SendHandshakeRequest().
   // Returns a net error code, possibly ERR_IO_PENDING, as stated above.
   //
@@ skipping 44 matching lines @@
                           const CompletionCallback& callback) = 0;
 
   // Closes the stream. All pending I/O operations (if any) are canceled
   // at this point, so |frame_chunks| can be freed.
   virtual void Close() = 0;
 
   // TODO(yutak): Add following interfaces:
   // - RenewStreamForAuth for authentication (is this necessary?)
   // - GetSSLInfo, GetSSLCertRequsetInfo for SSL
 
+  // WebSocketStreamBase derived functions
+  virtual WebSocketStream* AsWebSocketStream() { return this; }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(WebSocketStream);
 };
 
 }  // namespace net
 
 #endif  // NET_WEBSOCKETS_WEBSOCKET_STREAM_H_