Revert "Try to avoid vertex colors in Texture/FillRect ops when possible."

This reverts commit e0b989e5e3ab64f3585fe1bf0228e964dad0678c.

Reason for revert: gms

Original change's description:
> Try to avoid vertex colors in Texture/FillRect ops when possible.
> 
> Avoids unnecessary fragment shader color multiplication.
> 
> Change-Id: I353d3ca91824ce20c9e9af1c5c84ab9953ddd8ab
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201004
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>

TBR=bsalomon@google.com,michaelludwig@google.com

Change-Id: I42b37e50c1c0185d8f8a52984c9350464004880e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201081
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>