Since the SkShaders, etc will need access to SkPaintParamKeys and the SkShaderCodeDictionary they can't be buried in the skgpu namespace.
The currently planned signature for addToKey is:
void addToKey(SkShaderCodeDictionary*, SkBackend, SkPaintParamsKey*) const;
This CL doesn't modify the classes beyond what is needed to move them.
Bug: skia:12701
Change-Id: I18bbf6d6c3a768427112a3d19a9ccf2d46a23ad2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/494237
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
