Factor out ServerThread from the QUIC EndToEndTest in order to reuse in

net/tools/quic/quic_in_memory_cache.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_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
 #define NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
 
 #include <string>
 
 #include "base/containers/hash_tables.h"
@@ skipping 40 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(Response);
   };
   static QuicInMemoryCache* GetInstance();
 
   // Retrieve a response from this cache for a given request.
   // If no appropriate response exists, NULL is returned.
   // Currently, responses are selected based on request URI only.
   const Response* GetResponse(const BalsaHeaders& request_headers) const;
 
+  // Adds a response to the cache if no matching entry exists.
+  // Otherwise it verifies that the existing entry matches.
+  void AddOrVerifyResponse(base::StringPiece method,
+                           base::StringPiece path,
+                           base::StringPiece version,
+                           base::StringPiece response_code,
+                           base::StringPiece response_detail,
+                           base::StringPiece body);
+
   // Add a response to the cache.
   void AddResponse(const BalsaHeaders& request_headers,
                    const BalsaHeaders& response_headers,
                    base::StringPiece response_body);
 
   void ResetForTests();
 
  private:
   typedef base::hash_map<std::string, Response*> ResponseMap;
-
+  friend struct DefaultSingletonTraits<QuicInMemoryCache>;
 
   QuicInMemoryCache();
-  friend struct DefaultSingletonTraits<QuicInMemoryCache>;
   ~QuicInMemoryCache();
 
   void Initialize();
   std::string GetKey(const BalsaHeaders& response_headers) const;
 
   // Cached responses.
   ResponseMap responses_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicInMemoryCache);
 };
 
 }  // namespace tools
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_