Inline fast path for GrPaint::isConstantBlendedColor when no color FPs and src-over blend.

src/gpu/GrPaint.cpp

Index: src/gpu/GrPaint.cpp
diff --git a/src/gpu/GrPaint.cpp b/src/gpu/GrPaint.cpp
index 7bf9b6d568267b6a63bd29f6e077775f93de4f89..d33881c09d8a0d71e78f28b316f3a8ca0bc48160 100644
--- a/src/gpu/GrPaint.cpp
+++ b/src/gpu/GrPaint.cpp
@@ -51,11 +51,11 @@ void GrPaint::addCoverageTextureProcessor(GrTexture* texture,
                                                                    params));
 }
 
-bool GrPaint::isConstantBlendedColor(GrColor* color) const {
+bool GrPaint::internalIsConstantBlendedColor(GrColor paintColor, GrColor* color) const {
     GrProcOptInfo colorProcInfo;
     colorProcInfo.calcWithInitialValues(
         sk_sp_address_as_pointer_address(fColorFragmentProcessors.begin()),
-        this->numColorFragmentProcessors(), this->getColor(), kRGBA_GrColorComponentFlags, false);
+        this->numColorFragmentProcessors(), paintColor, kRGBA_GrColorComponentFlags, false);
 
     GrXPFactory::InvariantBlendedColor blendedColor;
     if (fXPFactory) {