Revert "Remove interpolants are inaccurate workaround for Adreno 3xx."

This reverts commit a7a278205bb040061cb4ba46839efe18635c7edc.

Reason for revert: Chrome change had to be reverted because of new failures on Nexus 9 and 6P.

Original change's description:
> Remove interpolants are inaccurate workaround for Adreno 3xx.
> 
> The chrome screenshot unit test that led to adding this workaround has
> been adjusted to avoid testing AA edges of rendered rectangles. We're
> accepting the inaccuracy in favor of increased performance.
> 
> Chrome change: https://chromium-review.googlesource.com/c/chromium/src/+/1129041
> 
> Bug: chromium:847984
> Change-Id: I9b714ade2a67e956ebb2773ebe3b8632dc3a50c6
> Reviewed-on: https://skia-review.googlesource.com/140180
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> Auto-Submit: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

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

Change-Id: Ic6b0e5a343556e59d144852f9fa5b561302f9781
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:847984
Reviewed-on: https://skia-review.googlesource.com/140380
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gpu/GrShaderCaps.h b/src/gpu/GrShaderCaps.h
index 66c75dfebb..e16c9f6d5b 100644
--- a/src/gpu/GrShaderCaps.h
+++ b/src/gpu/GrShaderCaps.h
@@ -121,6 +121,9 @@ public:
     // If false, SkSL uses a workaround so that sk_FragCoord doesn't actually query gl_FragCoord
     bool canUseFragCoord() const { return fCanUseFragCoord; }
 
+    // If true interpolated vertex shader outputs are inaccurate.
+    bool interpolantsAreInaccurate() const { return fInterpolantsAreInaccurate; }
+
     // If true, short ints can't represent every integer in the 16-bit two's complement range as
     // required by the spec. SKSL will always emit full ints.
     bool incompleteShortIntPrecision() const { return fIncompleteShortIntPrecision; }
@@ -274,6 +277,7 @@ private:
     bool fMustObfuscateUniformColor                   : 1;
     bool fMustGuardDivisionEvenAfterExplicitZeroCheck : 1;
     bool fCanUseFragCoord                             : 1;
+    bool fInterpolantsAreInaccurate                   : 1;
     bool fIncompleteShortIntPrecision                 : 1;
 
     const char* fVersionDeclString;