[PerformanceControlOfEmbeddedContent] Consider non-breaking enforcement options

[lflores-ms]

Loose transcript from BlinkOn talk: 28:06

People are terrified of breakage, right? But if we have scheduling hints, if we can deprioritize, we can just say "if you don't conform to these rules you're going to be slower". Maybe that will help make it less of a nuclear option that people are very afraid of.