test for bug 964376

--HG--
extra : transplant_source : %5D%1C%AD%A5%8D%BCT%11%CAR%1F%A3O%1B3%E33%E7%81%DE
b=972678 move stream time methods from WebAudioUtils to AudioNodeStream r=padenot

Trying to clear up which stream parameter is which.

--HG--
extra : transplant_source : D%94%23%60M%82%7E%D8%FF%8A%D3%C8%9F%25%D6%7E%EA%19%80%E9
b=972678 round double times to ticks consistently and round to nearest r=padenot

--HG--
extra : transplant_source : Q%B5%155%81%7C%8BQ4%EB%BD%E9h%A7%8E%94%C9%EC%A2q
test for bug 956489

--HG--
extra : transplant_source : D%29%7CvI%1D%BC%B4%A8%10%02%F5%BF%ECV%D2%7C%1C%27%B8