1) extend GrFPArgs to track pre/post local matrices, add helpers for
creating pre/post wrapper args
2) add a SkShaderBase helper (totalLocalMatrix) to centralize the LM
sandwich logic.
3) update call sites to use the above
4) rename SkMatrixFilter::makeWithLocalMatrix -> makeWithMatrix, to
disambiguate vs. SkShader::makeWithLocalMatrix.
BUG=skia:7744
Change-Id: Ib2b7b007e6924979b00649dde7c94ef4b34771f1
Reviewed-on: https://skia-review.googlesource.com/119330
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2097fd03ff