Reland "Add small offset to t in GrLinearGradientLayout."

This reverts commit 4a20dbeaf31a549c0ae857beb3b163962f9aa325.

Reason for revert: layout tests suppressed.

Original change's description:
> Revert "Add small offset to t in GrLinearGradientLayout."
> 
> This reverts commit 1a15723397a069c07705f8ed4f9f4c9a0c194816.
> 
> Reason for revert: causes two layout tests to "fail". Need to disable tests
> 
> Original change's description:
> > Add small offset to t in GrLinearGradientLayout.
> > 
> > This works around a varying interpolation issue when a hard stop occurs
> > a along a row or column of pixel centers.
> > 
> > Bug: chromium:938592
> > Change-Id: I4c239b2831c3e901cbbfa43f0a60a3d7fb0fef75
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/200939
> > Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> > Commit-Queue: Brian Salomon <bsalomon@google.com>
> 
> TBR=bsalomon@google.com,michaelludwig@google.com
> 
> Change-Id: Iebe45929050b8ab1d07574518a1b3d9ac5147512
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: chromium:938592
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201655
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:938592
Change-Id: I3020bbe2f2bddf5b933dac56f39d821681a1e070
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201617
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed