Check XpFactory equality in DrawState

src/gpu/effects/GrPorterDuffXferProcessor.cpp

Index: src/gpu/effects/GrPorterDuffXferProcessor.cpp
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
index 04a7b1fda3e97c09e851620c14fc0963b375808d..55e0c93b23ad03d355ea39969e31c5a7c0cb2eb2 100644
--- a/src/gpu/effects/GrPorterDuffXferProcessor.cpp
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -65,6 +65,11 @@ void GrPorterDuffXferProcessor::onComputeInvariantOutput(GrInvariantOutput* inou
 
 ///////////////////////////////////////////////////////////////////////////////
 
+GrPorterDuffXPFactory::GrPorterDuffXPFactory(GrBlendCoeff src, GrBlendCoeff dst)
+    : fSrc(src), fDst(dst) {
+    this->initClassID<GrPorterDuffXPFactory>();
+}
+
 GrXPFactory* GrPorterDuffXPFactory::Create(SkXfermode::Mode mode) {
     switch (mode) {
         case SkXfermode::kClear_Mode: {