This lets the WindowServer do all of the color correction for us
including WebGL and 2D canvas.
There's some concern that this will increase GPU usage as
reported in https://bugs.chromium.org/p/chromium/issues/detail?id=417150#c34.
However, the alernative of doing everything in device space isn't very
attractive because we'd have to color manage canvas and webgl ourselves.
Further, Chrome doesn't seem to be using the device space and it seems
like there's typically already a mix of color spaces in use so hopefully
the GPU increase is not high.
Differential Revision: https://phabricator.services.mozilla.com/D109383
4231661a1d