In  issue 667411 , we are updating rasterization in GraphicsLayer to use a ColorBehavior to convert color to a particular output space.

This bug is to create a mechanism for ensuring that the GraphicsLayer tree use the color space (or a good guess at the color space) of the monitor that the content is actually on.

In the worst case, we can just use the "last observed color space seen globally in the renderer process" when the GraphicsLayer was created. This won't be too terrible (the compositor will do any needed conversion when moving monitors), but we could do better.