Allow UI-using apps to show support errors
Allow UI-using apps to show support errors

By dispatching the shaka-ui-loaded event when we give up because of
browser support, apps can still finish their own setup and show an
appropriate support error.

This bug was discovered while working on #1857

Change-Id: If584ba916f7ba2e807f4861638d66319e8c8638f

tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player