CCPR: Rewrite path parsing

Creates a GrCCPRGeometry class that chops contours up into simple
segments that ccpr can render, and rewrites the GPU buffer creation to
be able to handle arbitrary lengths of ccpr geometry.

Bug: skia:
Change-Id: Iaa173a02729e177b0ed7ef7fbb9195d349be689d
Reviewed-on: https://skia-review.googlesource.com/41963
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
17 files changed