GrSWMaskHelper and GrSoftwarePathRenderer only need the textureProvider (not GrContext)

This is split out of: https://codereview.chromium.org/1988923002/ (Declassify GrClipMaskManager and Remove GrRenderTarget and GrDrawTarget from GrPipelineBuilder)

BUG=skia:

Review-Url: https://codereview.chromium.org/1993403002
7 files changed