Export surface flinger includes

* Before we start using libvrflinger, we need to export the
  surface flinger includes.

Bug: None
Test: Compile surfaceflinger and libvrflinger together
Change-Id: I88a56236f297eb58397fcda5ff28bfecbd4e0971
diff --git a/services/surfaceflinger/Android.bp b/services/surfaceflinger/Android.bp
new file mode 100644
index 0000000..cc93105
--- /dev/null
+++ b/services/surfaceflinger/Android.bp
@@ -0,0 +1,4 @@
+cc_library_static {
+    name: "libsurfaceflingerincludes",
+    export_include_dirs: ["."],
+}