Hooked up NetLog to DownloadItem, DownloadFile, and FileStream.

content/browser/download/download_item_impl.cc

 // 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.
 
 #include "content/browser/download/download_item_impl.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 224 matching lines @@
       is_otr_(is_otr),
       is_temporary_(!info.save_info.file_path.empty()),
       all_data_saved_(false),
       opened_(false),
       open_enabled_(true),
       delegate_delayed_complete_(false),
       bound_net_log_(bound_net_log) {
   delegate_->Attach();
   Init(true /* actively downloading */,
        download_net_logs::SRC_NEW_DOWNLOAD);
+
+  // Link the event sources.
+  bound_net_log_.AddEvent(
+      net::NetLog::TYPE_DOWNLOAD_URL_REQUEST,
+      make_scoped_refptr(new net::NetLogSourceParameter(
+          "source_dependency",
+          info.request_bound_net_log.source())));
+
+  info.request_bound_net_log.AddEvent(
+      net::NetLog::TYPE_DOWNLOAD_STARTED,
+      make_scoped_refptr(new net::NetLogSourceParameter(
+          "source_dependency",
+          bound_net_log_.source())));
 }
 
 // Constructing for the "Save Page As..." feature:
 DownloadItemImpl::DownloadItemImpl(Delegate* delegate,
                                    const FilePath& path,
                                    const GURL& url,
                                    bool is_otr,
                                    DownloadId download_id,
                                    const net::BoundNetLog& bound_net_log)
     : request_handle_(new NullDownloadRequestHandle()),
@@ skipping 863 matching lines @@
   std::map<const void*, ExternalData*>::iterator it =
       external_data_map_.find(key);
 
   if (it == external_data_map_.end()) {
     external_data_map_[key] = data;
   } else if (it->second != data) {
     delete it->second;
     it->second = data;
   }
 }