Revert of Add isSingleComponent bool to getConstantColorComponent

src/effects/SkLumaColorFilter.cpp

Index: src/effects/SkLumaColorFilter.cpp
diff --git a/src/effects/SkLumaColorFilter.cpp b/src/effects/SkLumaColorFilter.cpp
index 616bcde8912631ab103395d22a224df291d5ee61..ee2bfa654ccefe5529cef610c38112ec1f309016 100644
--- a/src/effects/SkLumaColorFilter.cpp
+++ b/src/effects/SkLumaColorFilter.cpp
@@ -73,6 +73,13 @@
         return GrTBackendFragmentProcessorFactory<LumaColorFilterEffect>::getInstance();
     }
 
+    virtual void getConstantColorComponents(GrColor* color,
+                                            uint32_t* validFlags) const SK_OVERRIDE {
+        // The output is always black.
+        *color = GrColorPackRGBA(0, 0, 0, GrColorUnpackA(*color));
+        *validFlags = kRGB_GrColorComponentFlags;
+    }
+
     class GLProcessor : public GrGLFragmentProcessor {
     public:
         GLProcessor(const GrBackendProcessorFactory& factory,
@@ -112,13 +119,6 @@
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE {
         return true;
     }
-
-    virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
-        // The output is always black.
-        inout->fColor = GrColorPackRGBA(0, 0, 0, GrColorUnpackA(inout->fColor));
-        inout->fValidFlags = kRGB_GrColorComponentFlags;
-        inout->fIsSingleComponent = false;
-    }
 };
 
 GrFragmentProcessor* SkLumaColorFilter::asFragmentProcessor(GrContext*) const {