Support colors w/ alpha in SVG 'stop' elements and 'feFlood'

Source/platform/graphics/filters/FEFlood.cpp

Index: Source/platform/graphics/filters/FEFlood.cpp
diff --git a/Source/platform/graphics/filters/FEFlood.cpp b/Source/platform/graphics/filters/FEFlood.cpp
index 03ed1f439c3d9f1fdb3475129feacf5cf41fedcd..7f31da7df637eed677fc74b73a065ff869df8cfc 100644
--- a/Source/platform/graphics/filters/FEFlood.cpp
+++ b/Source/platform/graphics/filters/FEFlood.cpp
@@ -80,13 +80,13 @@ void FEFlood::applySoftware()
     if (!resultImage)
         return;
 
-    Color color = colorWithOverrideAlpha(floodColor().rgb(), floodOpacity());
+    Color color = floodColor().modulate(floodOpacity());
     resultImage->context()->fillRect(FloatRect(FloatPoint(), absolutePaintRect().size()), color);
 }
 
 PassRefPtr<SkImageFilter> FEFlood::createImageFilter(SkiaImageFilterBuilder* builder)
 {
-    Color color = colorWithOverrideAlpha(floodColor().rgb(), floodOpacity());
+    Color color = floodColor().modulate(floodOpacity());
 
     SkImageFilter::CropRect rect = getCropRect(builder->cropOffset());
     SkAutoTUnref<SkColorFilter> cf(SkColorFilter::CreateModeFilter(color.rgb(), SkXfermode::kSrc_Mode));