GrFP can express distance vector field req., program builder declares variable for it

src/gpu/GrPaint.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 "GrPaint.h"
 
 #include "GrProcOptInfo.h"
 #include "effects/GrCoverageSetOpXP.h"
 #include "effects/GrPorterDuffXferProcessor.h"
 #include "effects/GrSimpleTextureEffect.h"
 
 GrPaint::GrPaint()
     : fAntiAlias(false)
     , fDisableOutputConversionToSRGB(false)
     , fAllowSRGBInputs(false)
+    , fUsesDistanceVectorField(false)
     , fColor(GrColor4f::FromGrColor(GrColor_WHITE)) {}
 
 void GrPaint::setCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage) {
     fXPFactory = GrCoverageSetOpXPFactory::Make(regionOp, invertCoverage);
 }
 
 void GrPaint::addColorTextureProcessor(GrTexture* texture,
                                        sk_sp<GrColorSpaceXform> colorSpaceXform,
                                        const SkMatrix& matrix) {
     this->addColorFragmentProcessor(GrSimpleTextureEffect::Make(texture,
@@ skipping 36 matching lines @@
                                                             colorProcInfo.isOpaque(),
                                                             &blendedColor);
     }
 
     if (kRGBA_GrColorComponentFlags == blendedColor.fKnownColorFlags) {
         *color = blendedColor.fKnownColor;
         return true;
     }
     return false;
 }