IE11: fullscreen button disappears

[joeyparrish]

• What version of Shaka Player are you using? v2.1.0 and nightly
• Are you using the demo app or your own custom app? demo app
• What browser and OS are you using? IE11 on Windows 10
• What did you do?

1. Click "load"
2. Try to go fullscreen

• What actually happened?

The fullscreen button is missing from the controls UI.

Manual inspection of the DOM reveals <div id="controls" class="casting">. After clicking "load", the player starts thinking we are in casting mode, and CSS hides the fullscreen button. It is still present before "load".

[michellezhuogg]

The root cause:
IE11 doesn't support the second parameter of toggle() method.
https://github.com/google/shaka-player/blob/master/demo/controls.js#L553
http://caniuse.com/#search=classList

[joeyparrish]

The fix for this has been cherry-picked and will be released in v2.1.5.