all DM to include from src/xml

BUG=skia:

Change-Id: Ifb88aa866bbf763a02a172a991077ef49fbe91b8
Reviewed-on: https://skia-review.googlesource.com/8695
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/public.bzl b/public.bzl
index a69b760..cf4a56b 100644
--- a/public.bzl
+++ b/public.bzl
@@ -488,6 +488,7 @@
     "src/pathops",
     "src/pipe/utils",
     "src/ports",
+    "src/xml",
     "tests",
     "tools",
     "tools/debugger",