JS should be able to render only in case of OfflineAudioContext. Normal AudioContext will be rendering by default after its instance is initialzed(in lazyInitialize()). startRendering may not be required in that case.
Created attachment 195235 [details] Patch
Comment on attachment 195235 [details] Patch Cleared review? from attachment 195235 [details] so that this bug does not appear in http://webkit.org/pending-review. If you would like this patch reviewed, please attach it to a new bug (or re-open this bug before marking it for review again).