Revert "Allow FPs to elevate default precision for the entire fragment program"

This reverts commit 92d7ccafdf896cf19764e025873d13315a76842d.

Reason for revert: Vulkan errors.

Original change's description:
> Allow FPs to elevate default precision for the entire fragment program
> 
> Currently, GrConfigConversionEffect is able to round-trip on many mobile
> GPUs because it uses highp for all intermediate variables (including the
> texture fetch result). Separating the texture sample into a different
> processor breaks that.
> 
> This is a blunt instrument, not to be used lightly.
> 
> Bug: skia:
> Change-Id: I2ab365e3da79628069e2eb727c43c2bf45bfd789
> Reviewed-on: https://skia-review.googlesource.com/10162
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> 

TBR=bsalomon@google.com,robertphillips@google.com,brianosman@google.com,ethannicholas@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: Iee5bb409f86a9cabecc76bd1273a5b3cef6af179
Reviewed-on: https://skia-review.googlesource.com/10967
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/src/gpu/GrGeometryProcessor.h b/src/gpu/GrGeometryProcessor.h
index e5222bf80a..2711b9a608 100644
--- a/src/gpu/GrGeometryProcessor.h
+++ b/src/gpu/GrGeometryProcessor.h
@@ -51,7 +51,6 @@ protected:
      */
     const Attribute& addVertexAttrib(const char* name, GrVertexAttribType type,
                                      GrSLPrecision precision = kDefault_GrSLPrecision) {
-        precision = (kDefault_GrSLPrecision == precision) ? kMedium_GrSLPrecision : precision;
         fAttribs.emplace_back(name, type, precision);
         fVertexStride += fAttribs.back().fOffset;
         return fAttribs.back();