We used to fully guarantee the order of requestFrame() and draw calls.
For instance:
```
ctx.draw(red);
stream.requestFrame();
ctx.draw(green);
```
would guarantee that a red frame ended up in the stream, and not the
green unless another frame was requested.
Now with frames being requested and pushed out on next refresh, we can
only guarantee that everything up to the requestFrame() call is included
in the next frame. Everything after the requestFrame() and before the
next refresh (stable state in most cases) will now also be inevitably
included.
