Anthony 50adf078fd [Re-land] Add SPIR-V FragmentShader API to painting.dart (flutter/engine#28208)
[Re-land] Add SPIR-V FragmentShader API to painting.dart

- Add a SPIR-V FragmentShader interface in painting.dart
- Create end to end pixel tests for ops supported by the SPIR-V to SkSL transpiler
- The end to end tests also test the c++ fragment shader implementation

Co-authored-by: Christopher Crawford <chriscraws@gmail.com>
2021-08-20 11:24:14 -04:00
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