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This adds an internal function to be able to query the screen space bounding box of the current clip entries contained in a given CoglClipStack. This bounding box which is cheap to determine can be useful to know the largest extents that might be updated while drawing with this clip stack. For example the plan is to use this as part of an optimized read-pixel path handled on the CPU which will need to track the currently valid extents of the last call to cogl_clear()