[#157002914] Fix bug: snapshot tool crashes CODAP
[#157002914] Fix bug: snapshot tool crashes CODAP

This occurred in Crome browser build 64 and above, and appears to be a
a consequence of tightening of cross-origin rules. Something in svg to
canvas conversion was interpreted as a cross-origin issue.

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap