travis: make chrome work

[nromanetti]

we need chrome to start when doing CI with travis

[jeanlouisboudart]

According to the following website, this can be configured in karma.conf.js :
http://blog.500tech.com/setting-up-travis-ci-to-run-tests-on-latest-google-chrome-version/

Add the following in karma.conf.js :

customLaunchers: {  
  Chrome_travis_ci: {
    base: 'Chrome',
    flags: ['--no-sandbox']
  }
}
if (process.env.TRAVIS) {
  config.browsers = ['Firefox', 'Chrome_travis_ci']
  config.singleRun = true
}

Here is a complete example :
https://github.com/MrOrz/SeeSS/blob/master/test/karma.conf.js

[jeanlouisboudart]

The no sandbox option seems to be already generated by angular cli.
I installe chrome and configured travis ci to use it. Builds is now green with karma tests enabled !