Move metadata in OWNERS files to DIR_METADATA files

Bug: crbug.com/1113033
Change-Id: Icbc4b471740cf165c4a533f9439604224f87eff2
diff --git a/DIR_METADATA b/DIR_METADATA
new file mode 100644
index 0000000..592fce2
--- /dev/null
+++ b/DIR_METADATA
@@ -0,0 +1,4 @@
+monorail {
+  component: "Speed>Tracing"
+}
+team_email: "tracing@chromium.org"