That way we can capture both the actual changes (clip region) and the
area that was redrawn (render region), which in OpenGL might not be
identical.
Nothing shows the render region yet though...
We now record all render operations and display them.
Warning: This is very brute force, you can't clear the recordings or
turn recording off. And this thing easily records 25MB per recorded
frame, so be careful to not run out of memory and get your browser
killed. ;)
This one introduces the Recording object which is essentially a single
instance of something that happened.
The RenderRecording is an instance of an actual rendering operation.
