Harry Terkelsen 23cd477163 Refactor CanvasKit backend in preparation for platform views (flutter/engine#13935)
* SkCanvas -> SkLayerCanvas

SkRecordingCanvas -> SkCanvas

* Move files

* WIP on canvas refactor

* Refactor CanvasKit backend

* fix tests

* update licenses

* Respond to PR comments
2019-11-25 18:21:45 -08:00
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