Add isSingleComponent bool to getConstantColorComponent

src/gpu/GrOptDrawState.cpp

Index: src/gpu/GrOptDrawState.cpp
diff --git a/src/gpu/GrOptDrawState.cpp b/src/gpu/GrOptDrawState.cpp
index 98a5689d534b72425a5df85f6409b64fd0f11dc6..424e21f39f1a5c2fd7c09f64f7e6f2de0b196714 100644
--- a/src/gpu/GrOptDrawState.cpp
+++ b/src/gpu/GrOptDrawState.cpp
@@ -172,6 +172,7 @@ void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
     // Set up color and flags for ConstantColorComponent checks
     GrColor color;
     uint32_t validComponentFlags;
+    bool isSingleComponent = false;
     if (!this->hasColorVertexAttribute()) {
         color = ds.getColor();
         validComponentFlags = kRGBA_GrColorComponentFlags;
@@ -191,7 +192,7 @@ void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
             firstColorStage = i;
             fInputColorIsUsed = false;
         }
-        fp->getConstantColorComponents(&color, &validComponentFlags);
+        fp->getConstantColorComponents(&color, &validComponentFlags, &isSingleComponent);
         if (kRGBA_GrColorComponentFlags == validComponentFlags) {
             firstColorStage = i + 1;
             fColor = color;