Create helper functions to use in computeInvariantOutput calls

src/gpu/effects/GrTextureDomain.cpp

Index: src/gpu/effects/GrTextureDomain.cpp
diff --git a/src/gpu/effects/GrTextureDomain.cpp b/src/gpu/effects/GrTextureDomain.cpp
index 21178576c6b61b1b7a3ea2f4795f81e9b9addd72..2c6a99e929f35025476c9570603b3c8b95130df8 100644
--- a/src/gpu/effects/GrTextureDomain.cpp
+++ b/src/gpu/effects/GrTextureDomain.cpp
@@ -271,11 +271,10 @@ bool GrTextureDomainEffect::onIsEqual(const GrProcessor& sBase) const {
 
 void GrTextureDomainEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
     if (GrTextureDomain::kDecal_Mode == fTextureDomain.mode()) { // TODO: helper
-        inout->fValidFlags = 0;
+        inout->unknownOutput();

[bsalomon, 2014/10/10 19:48:16]

this looks like it could be modulatebyunknowncolor

[egdaniel, 2014/10/13 16:44:58]

Done.

     } else {
         this->updateInvariantOutputForModulation(inout);

[bsalomon, 2014/10/10 19:48:16]

check for opaque config?

[egdaniel, 2014/10/13 16:44:58]

This is checked for in updateInvariantOutputForModulation() see previous comment
on that function

     }
-    inout->fIsSingleComponent = false;
 }
 
 ///////////////////////////////////////////////////////////////////////////////