Revert "re-land of skslc now automatically turns on derivatives support"

This reverts commit d7d1997643db3b9b5caaaac235c0e2cd0fa23ec2.

This breaks the Chromium roll (it did last time it landed too).
https://codereview.chromium.org/2429853002

Please gate your next attempt on at least one of linux_android_rel_ng, linux_chromium_rel_ng, or mac_chromium_rel_ng.

TBR=benjaminwagner@google.com,ethannicholas@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I999d4af70a5704b8990f3cd7d145eabff57646f5
Reviewed-on: https://skia-review.googlesource.com/3590
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gpu/instanced/InstanceProcessor.cpp b/src/gpu/instanced/InstanceProcessor.cpp
index 55be89ebb6..82116c4522 100644
--- a/src/gpu/instanced/InstanceProcessor.cpp
+++ b/src/gpu/instanced/InstanceProcessor.cpp
@@ -1408,6 +1408,7 @@ void GLSLInstanceProcessor::BackendMultisample::onEmitCode(GrGLSLVertexBuilder*,
         if (arcTest && fBatchInfo.fHasPerspective) {
             // The non-perspective version accounts for fwidth() in the vertex shader.
             // We make sure to take the derivative here, before a neighbor pixel may early accept.
+            f->enableFeature(GrGLSLPPFragmentBuilder::kStandardDerivatives_GLSLFeature);
             f->appendPrecisionModifier(kHigh_GrSLPrecision);
             f->codeAppendf("vec2 arcTest = %s - 0.5 * fwidth(%s);",
                            fArcTest.fsIn(), fArcTest.fsIn());