Added Net logging to FileStream.

net/base/net_log_event_type_list.h

Index: net/base/net_log_event_type_list.h
diff --git a/net/base/net_log_event_type_list.h b/net/base/net_log_event_type_list.h
index 44f6f22bbf26a48445921100295fd301d65fb8cc..804a68ff0bc6147b2adf2f39892092cc50f604d7 100644
--- a/net/base/net_log_event_type_list.h
+++ b/net/base/net_log_event_type_list.h
@@ -1407,3 +1407,39 @@ EVENT_TYPE(HTTP_PIPELINED_CONNECTION_RECEIVED_HEADERS)
 //     "must_close": <True if the pipeline must shut down>,
 //   }
 EVENT_TYPE(HTTP_PIPELINED_CONNECTION_STREAM_CLOSED)
+
+// ------------------------------------------------------------------------
+// FileStream events.
+// ------------------------------------------------------------------------
+
+// This event is created when a file stream is associated with a NetLog source.
+// It indicates what file stream event source is used.
+//   {
+//     "source_dependency": <Source id of the download>,
+//   }
+EVENT_TYPE(FILE_STREAM_SOURCE)
+
+// This event is created when a file stream is associated with a NetLog source.
+//   {
+//     "source_dependency": <Source id of the download>,
+//   }
+EVENT_TYPE(FILE_STREAM_BOUND_TO_OWNER)
+
+// This event lasts the lifetime of a file stream.
+EVENT_TYPE(FILE_STREAM_ALIVE)
+
+// This event is created when a file stream operation is opened.
+//   {
+//     "file_name".
+//   }
+EVENT_TYPE(FILE_STREAM_OPEN)
+
+// This event is created when a file stream operation is closed.
+EVENT_TYPE(FILE_STREAM_CLOSE)
+
+// This event is created when a file stream operation has an error.
+//   {
+//     "operation": open, write, close, etc.
+//     "sys_error": OS-dependent error code.
+//   }
+EVENT_TYPE(FILE_STREAM_ERROR)