Jim Graham 9e747c2eb6 Delete last usages of MockCanvas test mechanism (flutter/engine#55840)
The MockCanvas API was originally used to test the output of rendering methods to match them against a reference set of "MockData" structures. This API has been superseded by just using a DisplayListBuilder to record reference operations and then to compare the resulting DisplayList objects.

This PR deletes the last remaining uses of MockCanvas as well as the mechanism itself.
2024-10-12 05:15:17 +00:00
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