Add stubs for a NULL renderer.

BUG=angleproject:1468

Change-Id: I2ed2b65a4b6f6ea3dda61c0467aef95e407cd38c
Reviewed-on: https://chromium-review.googlesource.com/388844
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
diff --git a/scripts/generate_new_renderer.py b/scripts/generate_new_renderer.py
index 2ad89ed..ba89c0f 100644
--- a/scripts/generate_new_renderer.py
+++ b/scripts/generate_new_renderer.py
@@ -41,6 +41,7 @@
     'FenceSync',
     'Framebuffer',
     'Image',
+    'Path',
     'Program',
     'Query',
     'Renderbuffer',