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 85af19cf551fd636f31c13d01ce680e8b3394b00..31a9dbcaa4b474d72a1b71147e0994a299716231 100644
--- a/src/effects/SkArithmeticMode.cpp
+++ b/src/effects/SkArithmeticMode.cpp
@@ -289,8 +289,6 @@ public:
     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; }
@@ -300,6 +298,9 @@ public:
 private:
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE;
 
+    virtual void onGetConstantColorComponents(GrColor* color, uint32_t* validFlags,
+                                              bool* isSingleComponent) const SK_OVERRIDE;
+
     GrArithmeticEffect(float k1, float k2, float k3, float k4, bool enforcePMColor,
                        GrTexture* background);
     float                       fK1, fK2, fK3, fK4;
@@ -344,7 +345,8 @@ const GrBackendFragmentProcessorFactory& GrArithmeticEffect::getFactory() const
     return GrTBackendFragmentProcessorFactory<GrArithmeticEffect>::getInstance();
 }
 
-void GrArithmeticEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
+void GrArithmeticEffect::onGetConstantColorComponents(GrColor* color, uint32_t* validFlags,
+                                                      bool* isSingleComponent) const {
     // TODO: optimize this
     *validFlags = 0;
 }