Hand craft an A/B test of SDCH compression...

net/base/filter_unittest.h

 // Copyright (c) 2006-2009 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_BASE_FILTER_UNITTEST_H_
 #define NET_BASE_FILTER_UNITTEST_H_
 
 #include <string>
 
@@ skipping 49 matching lines @@
   virtual bool IsSdchResponse() const { return is_sdch_response_; }
 
   // How many bytes were fed to filter(s) so far?
   virtual int64 GetByteReadCount() const { return 0; }
 
   virtual int GetResponseCode() const { return response_code_; }
 
   // What is the desirable input buffer size for these filters?
   virtual int GetInputStreamBufferSize() const { return buffer_size_; }
 
+  virtual void RecordPacketStats(StatisticSelector statistic) const {}
 
  private:
   int buffer_size_;
   std::string mime_type_;
   GURL gurl_;
   base::Time request_time_;
   bool is_cached_content_;
   bool is_download_;
   bool is_sdch_response_;
   int response_code_;
 
   DISALLOW_COPY_AND_ASSIGN(MockFilterContext);
 };
 
 #endif  // NET_BASE_FILTER_UNITTEST_H_