Bug 1598420 - Land PiP image asset used in What's New panel message r=Mardak

Differential Revision: https://phabricator.services.mozilla.com/D54178

--HG--
extra : moz-landing-system : lando

browser/base/content/test/static/browser_all_files_referenced.js

@@ -37,6 +37,8 @@ var gExceptionPaths = [
 
   // https://github.com/mozilla/activity-stream/issues/3053
   "resource://activity-stream/data/content/tippytop/images/",
+  // These resources are referenced by messages delivered through Remote Settings
+  "resource://activity-stream/data/content/assets/remote/",
 
   // browser/extensions/pdfjs/content/build/pdf.js#1999
   "resource://pdf.js/web/images/",

browser/components/newtab/data/content/assets/remote/pip-message-icon.svg

@@ -0,0 +1 @@
+<svg width="64" height="64" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><rect fill="#0060DF" width="64" height="64" rx="6"/><path d="M46 34a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2H34a2 2 0 0 1-2-2v-8a2 2 0 0 1 2-2zm-4-16c3.308 0 6 2.692 6 6v4a2 2 0 1 1-4 0v-4c0-1.104-.898-2-2-2H22c-1.102 0-2 .896-2 2v16c0 1.104.898 2 2 2h4a2 2 0 1 1 0 4h-4c-3.308 0-6-2.692-6-6V24c0-3.308 2.692-6 6-6zm-19.708 6.292a1.003 1.003 0 0 1 1.416 0L28 28.586V27a1 1 0 0 1 2 0v4a1.003 1.003 0 0 1-1 1h-4a1 1 0 0 1 0-2h1.586l-4.294-4.292a1.003 1.003 0 0 1 0-1.416z" fill="#F9F9FA"/></g></svg>