Make GrDrawContext::internalDrawPath cons up its own GrPipelineBuilder

Hopefully, this better defines (and reduces) the lifetime and reuse of GrPipelineBuilder objects in GrDrawContext.

TBR=bsalomon@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1730903007

Committed: https://skia.googlesource.com/skia/+/00fddebe56fabea67dcc08762805c1294eebf5bf

Review URL: https://codereview.chromium.org/1730903007
2 files changed