Adds URLRequestJob bytes read to NetLog.

net/base/net_log.h

Index: net/base/net_log.h
===================================================================
--- net/base/net_log.h	(revision 87467)
+++ net/base/net_log.h	(working copy)
@@ -202,6 +202,11 @@
   void EndEventWithNetErrorCode(NetLog::EventType event_type,
                                 int net_error) const;
 
+  // Logs a byte transfer event to the NetLog.  Determines whether to log the
+  // received bytes or not based on the current logging level.
+  void AddByteTransferEvent(NetLog::EventType event_type,
+                            int byte_count, char* bytes) const;
+
   NetLog::LogLevel GetLogLevel() const;
 
   // Returns true if the log level is LOG_ALL.