added support for PLS path rendering

src/gpu/effects/GrDisableColorXP.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "effects/GrDisableColorXP.h"
+#include "GrPipeline.h"
 #include "GrProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
 #include "glsl/GrGLSLXferProcessor.h"
 
 /**
  * This xfer processor disables color writing. Thus color and coverage and ignored and no blending
  * occurs. This XP is usful for things like stenciling.
  */
 class DisableColorXP : public GrXferProcessor {
@@ skipping 71 matching lines @@
 
 GrDisableColorXPFactory::GrDisableColorXPFactory() {
     this->initClassID<GrDisableColorXPFactory>();
 }
 
 GrXferProcessor*
 GrDisableColorXPFactory::onCreateXferProcessor(const GrCaps& caps,
                                                const GrPipelineOptimizations& optimizations,
                                                bool hasMixedSamples,
                                                const DstTexture* dst) const {
+    SkASSERT(!optimizations.fOverrides.fUsePLSDstRead);
     return DisableColorXP::Create();
 }
 
 GR_DEFINE_XP_FACTORY_TEST(GrDisableColorXPFactory);
 
 const GrXPFactory* GrDisableColorXPFactory::TestCreate(GrProcessorTestData*) {
     return GrDisableColorXPFactory::Create();
 }