update slides

BUG=skia:

Review URL: https://codereview.chromium.org/686853005
diff --git a/resources/slides_utils.lua b/resources/slides_utils.lua
index f687d87..3b1230c 100644
--- a/resources/slides_utils.lua
+++ b/resources/slides_utils.lua
@@ -95,7 +95,8 @@
             end
         end
     end
---    pretty_print_slides(slides)
+    flush(slides, block)
+
     return slides
 end