Add gitiles as core plugin

Feature: Issue 10334
Change-Id: I5ebca8a20d0933fb920cee17f46ceefad6309656
diff --git a/.gitmodules b/.gitmodules
index 4ce7b5f..010b292 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -18,6 +18,11 @@
 	url = ../plugins/download-commands
 	branch = .
 
+[submodule "plugins/gitiles"]
+	path = plugins/gitiles
+	url = ../plugins/gitiles
+	branch = .
+
 [submodule "plugins/hooks"]
 	path = plugins/hooks
 	url = ../plugins/hooks