Update currentTime PausedAccuracy test and add js doc
Update currentTime PausedAccuracy test and add js doc

The currentTime has to be accurate at either when the video is paused or
when it's played after the pause.

Bug: 78182905
Change-Id: I05cbe1fbeee4b03e65d3066357ca9d8767c8262f

youtube/js_mse_eme,youtube/js_mse_eme,youtube/js_mse_eme