added support for PLS path rendering

src/gpu/gl/builders/GrGLProgramBuilder.cpp

Index: src/gpu/gl/builders/GrGLProgramBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.cpp b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
index dc9393db0739ea04c5acd824c903d2eb8b6f7720..e125f23c54e65a8cf142956a87ceb2c3d4d63b40 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
@@ -93,8 +93,11 @@ bool GrGLProgramBuilder::emitAndInstallProcs(GrGLSLExpr4* inputColor, GrGLSLExpr
     this->emitAndInstallFragProcs(0, this->pipeline().numColorFragmentProcessors(), inputColor);
     this->emitAndInstallFragProcs(this->pipeline().numColorFragmentProcessors(), numProcs,
                                   inputCoverage);
-    this->emitAndInstallXferProc(*this->pipeline().getXferProcessor(), *inputColor, *inputCoverage,
-                                 this->pipeline().ignoresCoverage());
+    if (primProc.getPixelLocalStorageState() != GrPixelLocalStorageState::kDraw_State) {
+        this->emitAndInstallXferProc(*this->pipeline().getXferProcessor(), *inputColor, 
+                                     *inputCoverage, this->pipeline().ignoresCoverage(),
+                                     primProc.getPixelLocalStorageState());
+    }
     return true;
 }
 
@@ -221,7 +224,8 @@ void GrGLProgramBuilder::emitAndInstallProc(const GrPrimitiveProcessor& gp,
 void GrGLProgramBuilder::emitAndInstallXferProc(const GrXferProcessor& xp,
                                                 const GrGLSLExpr4& colorIn,
                                                 const GrGLSLExpr4& coverageIn,
-                                                bool ignoresCoverage) {
+                                                bool ignoresCoverage,
+                                                GrPixelLocalStorageState plsState) {
     // Program builders have a bit of state we need to clear with each effect
     AutoStageAdvance adv(this);
 
@@ -253,7 +257,8 @@ void GrGLProgramBuilder::emitAndInstallXferProc(const GrXferProcessor& xp,
                                        ignoresCoverage ? nullptr : coverageIn.c_str(),
                                        fFS.getPrimaryColorOutputName(),
                                        fFS.getSecondaryColorOutputName(),
-                                       samplers);
+                                       samplers,
+                                       plsState == GrPixelLocalStorageState::kFinish_State);
     fXferProcessor->fGLProc->emitCode(args);
 
     // We have to check that effects and the code they emit are consistent, ie if an effect