Revert of Add isSingleComponent bool to getConstantColorComponent

src/effects/SkAlphaThresholdFilter.cpp

Index: src/effects/SkAlphaThresholdFilter.cpp
diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index 462cfec55eeabb6189debcb09403783c3edd7f37..09cc61851c6c43c071a8eb156c1d6f83995d8a50 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -76,6 +76,8 @@
     static const char* Name() { return "Alpha Threshold"; }
 
     virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE;
+    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
+
     float innerThreshold() const { return fInnerThreshold; }
     float outerThreshold() const { return fOuterThreshold; }
 
@@ -102,8 +104,6 @@
 
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE;
 
-    virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE;
-
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     float fInnerThreshold;
@@ -228,13 +228,13 @@
             this->fOuterThreshold == s.fOuterThreshold);
 }
 
-void AlphaThresholdEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
-    if (inout->isOpaque() && GrPixelConfigIsOpaque(this->texture(0)->config())) {
-        inout->fValidFlags = kA_GrColorComponentFlag;
+void AlphaThresholdEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
+    if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
+        GrPixelConfigIsOpaque(this->texture(0)->config())) {
+        *validFlags = kA_GrColorComponentFlag;
     } else {
-        inout->fValidFlags = 0;
-    }
-    inout->fIsSingleComponent = false;
+        *validFlags = 0;
+    }
 }
 
 #endif