3c5bf78a62
Impeller is resilient to OpenGL state being trampled upon when accessing the GL context. But the embedder may not necessarily be. Ideally, we'd be using saving the state and restoring it. But that might be too involved. For now, this sets the GL state to a sane "clean" state. We could, in theory, do this after each render pass but that unnecessarily increases API traffic. For now, I have added it at the transition of the embedder boundary.