Revert of Add isSingleComponent bool to getConstantColorComponent

src/gpu/effects/GrTextureDomain.cpp

Index: src/gpu/effects/GrTextureDomain.cpp
diff --git a/src/gpu/effects/GrTextureDomain.cpp b/src/gpu/effects/GrTextureDomain.cpp
index 90e3b412e638accd87e5dd3c5c8a5d0f0953072b..1d3b37dddd98d84b23745178381cf302b0fd59cd 100644
--- a/src/gpu/effects/GrTextureDomain.cpp
+++ b/src/gpu/effects/GrTextureDomain.cpp
@@ -269,13 +269,12 @@
            this->fTextureDomain == s.fTextureDomain;
 }
 
-void GrTextureDomainEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
+void GrTextureDomainEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
     if (GrTextureDomain::kDecal_Mode == fTextureDomain.mode()) { // TODO: helper
-        inout->fValidFlags = 0;
+        *validFlags = 0;
     } else {
-        this->updateInvariantOutputForModulation(inout);
-    }
-    inout->fIsSingleComponent = false;
+        this->updateConstantColorComponentsForModulation(color, validFlags);
+    }
 }
 
 ///////////////////////////////////////////////////////////////////////////////