Hooked up NetLog to DownloadItem, DownloadFile, and FileStream.

content/browser/renderer_host/resource_dispatcher_host.cc

Index: content/browser/renderer_host/resource_dispatcher_host.cc
diff --git a/content/browser/renderer_host/resource_dispatcher_host.cc b/content/browser/renderer_host/resource_dispatcher_host.cc
index f39d36465d68a243d1284793f3302fe30ab78758..190f044355add96ed4831e2a10c6d33401a05eac 100644
--- a/content/browser/renderer_host/resource_dispatcher_host.cc
+++ b/content/browser/renderer_host/resource_dispatcher_host.cc
@@ -27,6 +27,7 @@
 #include "content/browser/chrome_blob_storage_context.h"
 #include "content/browser/cross_site_request_manager.h"
 #include "content/browser/download/download_file_manager.h"
+#include "content/browser/download/download_net_log_parameters.h"
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/download/save_file_resource_handler.h"
@@ -65,6 +66,7 @@
 #include "net/base/load_flags.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_errors.h"
+#include "net/base/net_log.h"
 #include "net/base/registry_controlled_domain.h"
 #include "net/base/request_priority.h"
 #include "net/base/ssl_cert_request_info.h"
@@ -908,12 +910,29 @@ net::Error ResourceDispatcherHost::BeginDownload(
 
   request_id_--;
 
+  net::BoundNetLog bound_net_log =
+      net::BoundNetLog::Make(request->net_log().net_log(),
+                             net::NetLog::SOURCE_DOWNLOAD);
+
+    bound_net_log.AddEvent(
+        net::NetLog::TYPE_DOWNLOAD_URL_REQUEST,
+        make_scoped_refptr(new net::NetLogSourceParameter(
+            "source_dependency",
+            request->net_log().source())));
+
+    request->net_log().AddEvent(
+        net::NetLog::TYPE_DOWNLOAD_STARTED,
+        make_scoped_refptr(new net::NetLogSourceParameter(
+            "source_dependency",
+            bound_net_log.source())));
+
   scoped_refptr<ResourceHandler> handler(
       new DownloadResourceHandler(this,
                                   child_id,
                                   route_id,
                                   request_id_,
                                   url,
+                                  bound_net_log,
                                   download_file_manager_.get(),
                                   request.get(),
                                   started_cb,