Add XP to handle the cases where we disable color write.
BUG=skia:
Review URL: https://codereview.chromium.org/787233003
diff --git a/src/gpu/GrPaint.cpp b/src/gpu/GrPaint.cpp
index 1997796..da6408c 100644
--- a/src/gpu/GrPaint.cpp
+++ b/src/gpu/GrPaint.cpp
@@ -41,7 +41,7 @@
kRGBA_GrColorComponentFlags, false);
GrXPFactory::InvariantOutput output;
- fXPFactory->getInvariantOutput(colorProcInfo, coverageProcInfo, true, &output);
+ fXPFactory->getInvariantOutput(colorProcInfo, coverageProcInfo, &output);
if (kRGBA_GrColorComponentFlags == output.fBlendedColorFlags &&
0xFF == GrColorUnpackA(output.fBlendedColor)) {