Make skpaint->grpaint flow work for composing draws

src/effects/SkColorFilters.cpp

Index: src/effects/SkColorFilters.cpp
diff --git a/src/effects/SkColorFilters.cpp b/src/effects/SkColorFilters.cpp
index ece3295107e58d2beab55fb3341d4ee201837219..0c6a612355fecad8eefd615e44d23c7805917ff0 100644
--- a/src/effects/SkColorFilters.cpp
+++ b/src/effects/SkColorFilters.cpp
@@ -74,7 +74,7 @@ bool SkModeColorFilter::asFragmentProcessors(GrContext*, GrProcessorDataManager*
                                              SkTDArray<const GrFragmentProcessor*>* array) const {
     if (SkXfermode::kDst_Mode != fMode) {
         SkAutoTUnref<const GrFragmentProcessor> constFP(
-            GrConstColorProcessor::Create(SkColor2GrColor(fColor),
+            GrConstColorProcessor::Create(SkColorToPremulGrColor(fColor),
                                           GrConstColorProcessor::kIgnore_InputMode));
         const GrFragmentProcessor* fp =
             GrXfermodeFragmentProcessor::CreateFromSrcProcessor(constFP, fMode);