Queue present events to msc values. Fake msc events with a refresh rate of
about 60fps when flips are not possible. When flips are executed rely on
frame callbacks with a slow updating timer as fallback.
This is important for applications, that want to limit their framerate.
Signed-off-by: Roman Gilg <subdiff@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
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