sksl enum support

Bug: skia:
Change-Id: I4d505b31cf8b59de12bcdbca410aafc085977ba9
Reviewed-on: https://skia-review.googlesource.com/68621
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/gn/create_sksl_enums.py b/gn/create_sksl_enums.py
new file mode 100644
index 0000000..9a7f939
--- /dev/null
+++ b/gn/create_sksl_enums.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+#
+# Copyright 2017 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import subprocess
+import sys
+
+src = open(sys.argv[1], 'r')
+dst = open(sys.argv[2], 'w')
+dst.write('R"(')
+for line in src.readlines():
+    if not line.startswith("#"):
+        dst.write(line)
+dst.write(')"\n')
+src.close()
+dst.close()