Move logic to figure out if a socket can be reused into HttpStream.

net/http/http_stream_parser.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_HTTP_HTTP_STREAM_PARSER_H_
 #define NET_HTTP_HTTP_STREAM_PARSER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 55 matching lines @@
   bool IsResponseBodyComplete() const;
 
   bool CanFindEndOfResponse() const;
 
   bool IsMoreDataBuffered() const;
 
   bool IsConnectionReused() const;
 
   void SetConnectionReused();
 
-  bool IsConnectionReusable() const;
+  // Returns true if the underlying connection can be reused.
+  // The connection can be reused if:
+  // * It's still connected.
+  // * The response headers indicate the connection can be kept alive.
+  // * The end of the response can be found.
+  //
+  // Note that if response headers have yet to be received, this will return
+  // false.
+  bool CanReuseConnection() const;
 
   int64 received_bytes() const { return received_bytes_; }
 
   void GetSSLInfo(SSLInfo* ssl_info);
 
   void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info);
 
   // Encodes the given |payload| in the chunked format to |output|.
   // Returns the number of bytes written to |output|. |output_size| should
   // be large enough to store the encoded chunk, which is payload.size() +
@@ skipping 164 matching lines @@
   int upload_error_;
 
   base::WeakPtrFactory<HttpStreamParser> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamParser);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_PARSER_H_