allow for lua click handlers

BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/649013002
diff --git a/resources/test.lua b/resources/test.lua
index 84d3517..1029db4 100644
--- a/resources/test.lua
+++ b/resources/test.lua
@@ -69,6 +69,8 @@
     r2.bottom = r2.top + image:height() * 1;
     canvas:drawImageRect(image, nil, r2, 0.75);
     if x > 200 then x = 0 end;
+
+    return true -- so we can animate
 end
 
 onStartup()