Use GrVertexColor in various oval ops

p3_ovals GM exercises four different oval ops. Before, they all drew
wrong in extended range GPU configs. Now, they all draw correctly.

Bug: skia:
Change-Id: I4ea803b6325bfd20e9361880b1822cc6f0441cea
Reviewed-on: https://skia-review.googlesource.com/c/172480
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed