ISTWCMS-2563: Add tableau url to CSP

content-security-policy.php

@@ -37,7 +37,7 @@ $sites = array(
   '*.g.doubleclick.net',
   // Google's DoubleClick, for MSI's use.
   '6263835.fls.doubleclick.net',
-  // CDNjs (Cloudflare)
+  // CDNjs (Cloudflare).
   'cdnjs.cloudflare.com',
   // Twitter.
   '*.twitter.com',
@@ -89,6 +89,8 @@ $sites = array(
   '*.hscampaigns.com',
   // Used by MSI, confirmed by Joe Kwan.
   'secure.adnxs.com',
+  // Used by Tableau.
+  'public.tableau.com',
 );
 while ($site = array_shift($sites)) {
   $items[] = 'https://' . $site;