Use filter context to track stats better in SDCH filtering

net/url_request/url_request_job.h

 // Copyright (c) 2006-2008 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_URL_REQUEST_URL_REQUEST_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_JOB_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 177 matching lines @@
   void set_expected_content_size(const int64& size) {
     expected_content_size_ = size;
   }
 
   // Whether we have processed the response for that request yet.
   bool has_response_started() const { return has_handled_response_; }
 
   // FilterContext methods:
   // These methods are not applicable to all connections.
   virtual bool GetMimeType(std::string* mime_type) const { return false; }
+  virtual int64 GetByteReadCount() const;
   virtual bool GetURL(GURL* gurl) const;
   virtual base::Time GetRequestTime() const;
   virtual bool IsCachedContent() const;
-  virtual int GetInputStreambufferSize() const { return kFilterBufSize; }
+  virtual int GetInputStreamBufferSize() const { return kFilterBufSize; }
 
  protected:
   // Notifies the job that headers have been received.
   void NotifyHeadersComplete();
 
   // Notifies the request that the job has completed a Read operation.
   void NotifyReadComplete(int bytes_read);
 
   // Notifies the request that a start error has occurred.
   void NotifyStartError(const URLRequestStatus& status);
@@ skipping 96 matching lines @@
   net::IOBuffer *read_buffer_;
   int read_buffer_len_;
 
   // Used by HandleResponseIfNecessary to track whether we've sent the
   // OnResponseStarted callback and potentially redirect callbacks as well.
   bool has_handled_response_;
 
   // Expected content size
   int64 expected_content_size_;
 
+  // Total number of bytes read from network (or cache) and and typically handed
+  // to filter to process.  Used to histogram compression ratios, and error
+  // recovery scenarios in filters.
+  int64 filter_input_byte_count_;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequestJob);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_H_