Fix SkASSERT for convex paths with DAA
As DAA does not chop edges at Y extrema, it's valid for convex edges to
have only one edge (e.g., a single cubic edge with the valley shape \_/).
This wasn't an issue for production because DAA is never called for
convex paths by default.
Bug=skia:7015
Change-Id: Iac79801d6a24188970ef6f7bf723494a25d92a1e
Reviewed-on: https://skia-review.googlesource.com/42942
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
3 files changed