Revert of Add isSingleComponent bool to getConstantColorComponent

src/effects/SkArithmeticMode.cpp

Index: src/effects/SkArithmeticMode.cpp
diff --git a/src/effects/SkArithmeticMode.cpp b/src/effects/SkArithmeticMode.cpp
index b62b33db9a4ebcf30881104f877ccc001b71ae5f..85af19cf551fd636f31c13d01ce680e8b3394b00 100644
--- a/src/effects/SkArithmeticMode.cpp
+++ b/src/effects/SkArithmeticMode.cpp
@@ -289,6 +289,8 @@
     static const char* Name() { return "Arithmetic"; }
     GrTexture* backgroundTexture() const { return fBackgroundAccess.getTexture(); }
 
+    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
+
     float k1() const { return fK1; }
     float k2() const { return fK2; }
     float k3() const { return fK3; }
@@ -297,8 +299,6 @@
 
 private:
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE;
-
-    virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE;
 
     GrArithmeticEffect(float k1, float k2, float k3, float k4, bool enforcePMColor,
                        GrTexture* background);
@@ -344,10 +344,9 @@
     return GrTBackendFragmentProcessorFactory<GrArithmeticEffect>::getInstance();
 }
 
-void GrArithmeticEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
+void GrArithmeticEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
     // TODO: optimize this
-    inout->fValidFlags = 0;
-    inout->fIsSingleComponent = false;
+    *validFlags = 0;
 }
 
 ///////////////////////////////////////////////////////////////////////////////