Revert "Make TextureOp use multitexturing to batch draws of different SkImages."

This reverts commit 2e50d0f5f93f1290341be02a1aa553b981f9774f.

Reason for revert: Shader compilation error

Original change's description:
> Make TextureOp use multitexturing to batch draws of different SkImages.
> 
> On a benchmark drawing small texture backed images this shows a 50% improvement on a Pixel XL 2016 and a little better than that on a Z840. 
> 
> Change-Id: I5c307ef0d8615aeae67bae7393874ad7e52eb233
> Reviewed-on: https://skia-review.googlesource.com/42121
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

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

Change-Id: I28b9a139627e2492a2af53dd82fc8c43be94464b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/43920
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed