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

src/gpu/effects/GrBezierEffect.cpp

Index: src/gpu/effects/GrBezierEffect.cpp
diff --git a/src/gpu/effects/GrBezierEffect.cpp b/src/gpu/effects/GrBezierEffect.cpp
index 798695d4eced4bdc39484e09dd487521df5334d2..7f39b927c968259f5c06ed0b7d82a67c08b587f7 100644
--- a/src/gpu/effects/GrBezierEffect.cpp
+++ b/src/gpu/effects/GrBezierEffect.cpp
@@ -136,8 +136,6 @@ void GrGLConicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
 
     switch (fEdgeType) {
         case kHairlineAA_GrProcessorEdgeType: {
-            SkAssertResult(fragBuilder->enableFeature(
-                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
             fragBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s = 2.0 * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
@@ -165,8 +163,6 @@ void GrGLConicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
             break;
         }
         case kFillAA_GrProcessorEdgeType: {
-            SkAssertResult(fragBuilder->enableFeature(
-                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
             fragBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s ="
@@ -374,8 +370,6 @@ void GrGLQuadEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
 
     switch (fEdgeType) {
         case kHairlineAA_GrProcessorEdgeType: {
-            SkAssertResult(fragBuilder->enableFeature(
-                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
             fragBuilder->codeAppendf("vec2 duvdx = dFdx(%s.xy);", v.fsIn());
             fragBuilder->codeAppendf("vec2 duvdy = dFdy(%s.xy);", v.fsIn());
             fragBuilder->codeAppendf("vec2 gF = vec2(2.0 * %s.x * duvdx.x - duvdx.y,"
@@ -390,8 +384,6 @@ void GrGLQuadEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
             break;
         }
         case kFillAA_GrProcessorEdgeType: {
-            SkAssertResult(fragBuilder->enableFeature(
-                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
             fragBuilder->codeAppendf("vec2 duvdx = dFdx(%s.xy);", v.fsIn());
             fragBuilder->codeAppendf("vec2 duvdy = dFdy(%s.xy);", v.fsIn());
             fragBuilder->codeAppendf("vec2 gF = vec2(2.0 * %s.x * duvdx.x - duvdx.y,"
@@ -592,8 +584,6 @@ void GrGLCubicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
 
     switch (fEdgeType) {
         case kHairlineAA_GrProcessorEdgeType: {
-            SkAssertResult(fragBuilder->enableFeature(
-                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
             fragBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s = 3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
@@ -620,8 +610,6 @@ void GrGLCubicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
             break;
         }
         case kFillAA_GrProcessorEdgeType: {
-            SkAssertResult(fragBuilder->enableFeature(
-                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
             fragBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
             fragBuilder->codeAppendf("%s ="