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Once this patch lands, all content drawn by WebRender is drawn into a picture cache surface. This will incur some extra GPU memory overhead since there are extra GPU texture buffers. Much of this can be reduced by adding a couple of simple optimizations in future to detect tiles that are solid colors only. With this change, we'll now be able to provide exact dirty rects for the entire screen without any hacks, and start the work to draw into OS compositor surfaces directly. Differential Revision: https://phabricator.services.mozilla.com/D47395 --HG-- extra : moz-landing-system : lando