Add isSingleComponent bool to getConstantColorComponent

src/gpu/effects/GrDitherEffect.cpp

Index: src/gpu/effects/GrDitherEffect.cpp
diff --git a/src/gpu/effects/GrDitherEffect.cpp b/src/gpu/effects/GrDitherEffect.cpp
index fe7447d1797b8aa660a5f5412c5d0f8e7beb7238..e7f90acd8746c713e992f3ea1aa87f6a455f2570 100644
--- a/src/gpu/effects/GrDitherEffect.cpp
+++ b/src/gpu/effects/GrDitherEffect.cpp
@@ -30,8 +30,6 @@ public:
 
     typedef GLDitherEffect GLProcessor;
 
-    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
-
     virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE {
         return GrTBackendFragmentProcessorFactory<DitherEffect>::getInstance();
     }
@@ -44,13 +42,16 @@ private:
     // All dither effects are equal
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE { return true; }
 
+    virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE;
+
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrFragmentProcessor INHERITED;
 };
 
-void DitherEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
-    *validFlags = 0;
+void DitherEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
+    inout->fValidFlags = 0;
+    inout->fIsSingleComponent = false;
 }
 
 //////////////////////////////////////////////////////////////////////////////