ABR not respect user preferrence resolution

[kocoten1992]

Have you read the FAQ and checked for duplicate open issues?
Yes

What version of Shaka Player are you using?
v3.1.0

Can you reproduce the issue with our latest release version?
Yes

Can you reproduce the issue with the latest code from master?
Not sure, I'm using demo app to reproduce this

Are you using the demo app or your own custom app?
demo app

What browser and OS are you using?
Google Chrome

What did you do?

1. Go to https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;asset=https://storage.googleapis.com/shaka-demo-assets/sintel-widevine/dash.mpd;adTagUri=https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/ad_rule_samples&ciu_szs=300x250&ad_rule=1&impl=s&gdfp_req=1&env=vp&output=vmap&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ar%3Dpremidpostpod&cmsid=496&vid=short_onecue&correlator=;panel=HOME;build=uncompiled
2. select highest resolution, watch for about 10s
3. open network tab and throttle bandwidth to slow 3G

What did you expect to happen?
Video keep playing at user chosen resolution regardless of lagging.

What actually happened?
ABR kick in and downgrade resolution (resolution on menu still display the same - but you can see clearly the real video quality is much downgrade).
ABR should not override user preferrence and select different resolution for user, previous version don't do this - maybe this is a regression ?.

[joeyparrish]

Sounds like a regression, and it looks to me like it was introduced in #2663 . There should be a check there for the enabled state of the ABR manager before reacting to the network change event.