Add a GetAlternativeService method to HttpStream to return any

net/http/http_basic_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.
 //
 // HttpBasicStream is a simple implementation of HttpStream.  It assumes it is
 // not sharing a sharing with any other HttpStreams, therefore it just reads and
 // writes directly to the Http Stream.
 
 #ifndef NET_HTTP_HTTP_BASIC_STREAM_H_
 #define NET_HTTP_HTTP_BASIC_STREAM_H_
@@ skipping 54 matching lines @@
   void SetConnectionReused() override;
 
   bool CanReuseConnection() const override;
 
   int64_t GetTotalReceivedBytes() const override;
 
   int64_t GetTotalSentBytes() const override;
 
   bool GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const override;
 
+  bool GetAlternativeService(
+      AlternativeService* alternative_service) const override;
+
   void GetSSLInfo(SSLInfo* ssl_info) override;
 
   void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info) override;
 
   bool GetRemoteEndpoint(IPEndPoint* endpoint) override;
 
   Error GetTokenBindingSignature(crypto::ECPrivateKey* key,
                                  TokenBindingType tb_type,
                                  std::vector<uint8_t>* out) override;
 
   void Drain(HttpNetworkSession* session) override;
 
   void PopulateNetErrorDetails(NetErrorDetails* details) override;
 
   void SetPriority(RequestPriority priority) override;
 
  private:
   HttpStreamParser* parser() const { return state_.parser(); }
 
   HttpBasicState state_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpBasicStream);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_BASIC_STREAM_H_