Revert of drawVertices bug on gpu side (https://codereview.chromium.org/387113002/)

Revert of drawVertices bug on gpu side (https://codereview.chromium.org/387113002/)

Reason for revert:
compare gms failed on 6 images, I will check them and determine if they need a rebaseline or if the output is incorrect.

Original issue's description:
> Fixed the bug in drawVertices when no colors or texture coordinates are provided by modifying the grprimitive to klines and adjusting the indices.
>
> BUG=skia:2745
>
> Committed: https://skia.googlesource.com/skia/+/612364de87cb2012239c4f6435e8e11760617fdc

R=jvanverth@google.com, bsalomon@google.com, egdaniel@google.com
TBR=bsalomon@google.com, egdaniel@google.com, jvanverth@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2745

Author: dandov@google.com

Review URL: https://codereview.chromium.org/395613002