Remove some more GrColor references

Bug: skia:
Change-Id: I395395b1cd81a1d45ca779b2273015c8ed9fb882
Reviewed-on: https://skia-review.googlesource.com/c/168361
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index 1157ec5..168cce6 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -400,12 +400,12 @@
             }
 
             // We can ignore origColor here - alpha is unchanged by gamma
-            GrColor paintAlpha = GrColorPackA4(skPaint.getAlpha());
-            if (GrColor_WHITE != paintAlpha) {
+            float paintAlpha = skPaint.getColor4f().fA;
+            if (1.0f != paintAlpha) {
                 // No gamut conversion - paintAlpha is a (linear) alpha value, splatted to all
                 // color channels. It's value should be treated as the same in ANY color space.
                 grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
-                    SkPMColor4f::FromBytes_RGBA(paintAlpha),
+                    { paintAlpha, paintAlpha, paintAlpha, paintAlpha },
                     GrConstColorProcessor::InputMode::kModulateRGBA));
             }
         } else {
@@ -430,12 +430,12 @@
             grPaint->setColor4f(opaqueColor);
 
             // We can ignore origColor here - alpha is unchanged by gamma
-            GrColor paintAlpha = GrColorPackA4(skPaint.getAlpha());
-            if (GrColor_WHITE != paintAlpha) {
+            float paintAlpha = skPaint.getColor4f().fA;
+            if (1.0f != paintAlpha) {
                 // No gamut conversion - paintAlpha is a (linear) alpha value, splatted to all
                 // color channels. It's value should be treated as the same in ANY color space.
                 grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
-                    SkPMColor4f::FromBytes_RGBA(paintAlpha),
+                    { paintAlpha, paintAlpha, paintAlpha, paintAlpha },
                     GrConstColorProcessor::InputMode::kModulateRGBA));
             }
         } else {