Harry Terkelsen df30da9ec1 Use Skia to determine "actual" font name in CanvasKit backend (flutter/engine#16504)
* Use Skia to determine "actual" font name.

This way, we don't need to hard-code a mapping of Flutter names
to actual names, we can compute it when the font is registered.

* Refactor to only have loaded and unloaded fonts
2020-02-10 13:06:30 -08:00
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