Generalize the net module's LoadLog facility from a passive container, to an event stream (NetLog).

net/http/http_transaction.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_HTTP_HTTP_TRANSACTION_H_
 #define NET_HTTP_HTTP_TRANSACTION_H_
 
 #include <string>
 
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 
 namespace net {
 
+class BoundNetLog;
 class HttpRequestInfo;
 class HttpResponseInfo;
 class IOBuffer;
-class LoadLog;
 class X509Certificate;
 
 // Represents a single HTTP transaction (i.e., a single request/response pair).
 // HTTP redirects are not followed and authentication challenges are not
 // answered.  Cookies are assumed to be managed by the caller.
 class HttpTransaction {
  public:
   // Stops any pending IO and destroys the transaction object.
   virtual ~HttpTransaction() {}
 
   // Starts the HTTP transaction (i.e., sends the HTTP request).
   //
   // Returns OK if the transaction could be started synchronously, which means
   // that the request was served from the cache.  ERR_IO_PENDING is returned to
   // indicate that the CompletionCallback will be notified once response info
   // is available or if an IO error occurs.  Any other return value indicates
   // that the transaction could not be started.
   //
   // Regardless of the return value, the caller is expected to keep the
   // request_info object alive until Destroy is called on the transaction.
   //
   // NOTE: The transaction is not responsible for deleting the callback object.
   //
-  // Profiling information for the request is saved to |load_log| if non-NULL.
+  // Profiling information for the request is saved to |net_log| if non-NULL.
   virtual int Start(const HttpRequestInfo* request_info,
                     CompletionCallback* callback,
-                    LoadLog* load_log) = 0;
+                    const BoundNetLog& net_log) = 0;
 
   // Restarts the HTTP transaction, ignoring the last error.  This call can
   // only be made after a call to Start (or RestartIgnoringLastError) failed.
   // Once Read has been called, this method cannot be called.  This method is
   // used, for example, to continue past various SSL related errors.
   //
   // Not all errors can be ignored using this method.  See error code
   // descriptions for details about errors that can be ignored.
   //
   // NOTE: The transaction is not responsible for deleting the callback object.
@@ skipping 46 matching lines @@
   virtual LoadState GetLoadState() const = 0;
 
   // Returns the upload progress in bytes.  If there is no upload data,
   // zero will be returned.  This does not include the request headers.
   virtual uint64 GetUploadProgress() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_H_