Added option to disable watching progress

[forbesjo]

Description

This PR adds a flag to disable watching the progress event. The reason for this is that progress coming from the video element doesn't really mean anything when using MSE.

Specific Changes proposed

Added player.errors.disableProgress() to disable watching progress events. Defaults to false.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
• Reviewed by Two Core Contributors

[mjneil]

If a user wants to call player.errors(customOptions) to re-initialize the plugin with custom options, I think this would cause progress events to be un-ignored if the plugin was re-initialized after the disableProgress api is called.

[forbesjo]

That's true, the new API would also not be available when using a source element.

[misteroneill]

@mjneil That's correct, but I would say that's a feature not a bug. When you reinitialize this plugin, I think you'd expect whatever options you have provided to be the new options (not merged with the previous invocation).

@forbesjo Not sure what you mean by "when using a source element"...

[mjneil]

I assume its related to this

[forbesjo]

<video id=example-video width=600 height=300 class="video-js vjs-default-skin" controls>
  <source
     src="https://example.com/dash.mpd"
     type="application/dash+xml">
</video>

I'm under the impression that when setting a source this way the source handler cannot create a reference to the player and therefore cannot access its plugins. We saw a similar problem with the qualityLevels plugin

[misteroneill]

That seems... wrong, but maybe I'm not thinking clearly. Regardless, that doesn't sound like it stops this PR from moving forward.

[forbesjo]

It was either using the source element or setting a source as an option through videojs(). Either way this a niche setting that will be done the proper way eventually with middleware

[gkatsev]

Should we call onPlayStartMonitor in here? That'll cleanup the current monitors, specifically, the progress monitor, and then re-adds the listeners.