When OffscreenCanvas's commit (2D) happens, we create a WebGraphicsContext3DProvider instance. Note that creating this instance require a worker-->main-->worker round trip which is very expensive, and it could also cause deadlock, For example, If the main thread is waiting on a spinlock that is to be unlocked by a worker after commit().

This need to be addressed, in both accelerated and un-accelerated 2d canvas case.