Issue 6822 - Report browser test errors

test/runners/chromium_process.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 39 matching lines @@
 }
 
 module.exports = function(script, scriptName, ...scriptArgs)
 {
   return ensureChromium(CHROMIUM_REVISION).then(chromiumPath =>
   {
     return runScript(chromiumPath, script, scriptName, scriptArgs)
       .then(result => result)
       .catch(error =>
       {
+        console.log("chromium_process: error caught");
         throw error;
       });
   });
 };