Revert of Stop flattening GrCoordTransforms in parent GrFragmentProcessors. (patchset...

Revert of Stop flattening GrCoordTransforms in parent GrFragmentProcessors. (patchset #3 id:40001 of https://codereview.chromium.org/2339203002/ )

Reason for revert:
Crashing blink
 https://codereview.chromium.org/2351743002/

Original issue's description:
> Stop flattening GrCoordTransforms in parent GrFragmentProcessors.
>
> This changes moves to a model that iterates over GrCTs in a GrFP hierarchy when inserting transformations by GrGLSLPrimitiveProcessors.
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2339203002
>
> Committed: https://skia.googlesource.com/skia/+/d91237ee051523f439238042674ade99207fe4a6

TBR=egdaniel@google.com,robertphillips@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2351753002