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

src/gpu/GrOvalRenderer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrOvalRenderer.h"
 
 #include "GrBatchFlushState.h"
@@ skipping 445 matching lines @@
                                 &fViewMatrixUniform);
 
             // emit transforms
             this->emitTransforms(vertBuilder,
                                  varyingHandler,
                                  uniformHandler,
                                  gpArgs->fPositionVar,
                                  diegp.fInPosition->fName,
                                  args.fFPCoordTransformHandler);
 
-            SkAssertResult(fragBuilder->enableFeature(
-                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
             // for outer curve
             fragBuilder->codeAppendf("vec2 scaledOffset = %s.xy;", offsets0.fsIn());
             fragBuilder->codeAppend("float test = dot(scaledOffset, scaledOffset) - 1.0;");
             fragBuilder->codeAppendf("vec2 duvdx = dFdx(%s);", offsets0.fsIn());
             fragBuilder->codeAppendf("vec2 duvdy = dFdy(%s);", offsets0.fsIn());
             fragBuilder->codeAppendf("vec2 grad = vec2(2.0*%s.x*duvdx.x + 2.0*%s.y*duvdx.y,"
                                      "                 2.0*%s.x*duvdy.x + 2.0*%s.y*duvdy.y);",
                                      offsets0.fsIn(), offsets0.fsIn(), offsets0.fsIn(),
                                      offsets0.fsIn());
 
@@ skipping 1970 matching lines @@
 DRAW_BATCH_TEST_DEFINE(RRectBatch) {
     SkMatrix viewMatrix = GrTest::TestMatrixRectStaysRect(random);
     GrColor color = GrRandomColor(random);
     const SkRRect& rrect = GrTest::TestRRectSimple(random);
     bool needsDistance = random->nextBool();
     return create_rrect_batch(color, needsDistance, viewMatrix, rrect,
                               GrTest::TestStrokeRec(random));
 }
 
 #endif