In the case that the replayer triggers multiple FullSnapshot events, it
will call waitForStylesheetLoad multiple times. When the replayer
resumes, it could already have a timeoffset set from a previous
resume in a previous waitForStylesheetLoad call. In this case our new
timeoffset should be the value of our current time in the replay
(timer.timeOffset + getTimeOffset()). To solve this, I created a public
getCurrentTime function which correctly returns the time in the replay
and used that as our new timeoffset when resuming from a stylesheet
load.
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