Hooked up NetLog to DownloadItem, DownloadFile, and FileStream.

content/browser/download/download_item_impl.cc

Index: content/browser/download/download_item_impl.cc
diff --git a/content/browser/download/download_item_impl.cc b/content/browser/download/download_item_impl.cc
index cdcd10ec26126b42c7addd6f4a7a3685e394a24b..60e903e39f259c38b4e64358f8c533867347022a 100644
--- a/content/browser/download/download_item_impl.cc
+++ b/content/browser/download/download_item_impl.cc
@@ -242,6 +242,19 @@ DownloadItemImpl::DownloadItemImpl(
   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.bound_net_log.source())));
+
+  info.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: