Move GrInvariantOutput out of GrProcessor and into its own class.

src/gpu/effects/GrMatrixConvolutionEffect.h

Index: src/gpu/effects/GrMatrixConvolutionEffect.h
diff --git a/src/gpu/effects/GrMatrixConvolutionEffect.h b/src/gpu/effects/GrMatrixConvolutionEffect.h
index 5aee6c53afd859d16ef67d11247a2aacc87a03c6..999606213d0abbf48fdeeff7ee01e0a4d839d4d1 100644
--- a/src/gpu/effects/GrMatrixConvolutionEffect.h
+++ b/src/gpu/effects/GrMatrixConvolutionEffect.h
@@ -9,6 +9,7 @@
 #define GrMatrixConvolutionEffect_DEFINED
 
 #include "GrSingleTextureEffect.h"
+#include "GrInvariantOutput.h"
 #include "GrTextureDomain.h"
 
 // A little bit less than the minimum # uniforms required by DX9SM2 (32).
@@ -79,7 +80,7 @@ private:
 
     virtual bool onIsEqual(const GrFragmentProcessor&) const SK_OVERRIDE;
 
-    virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
+    virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE {
         // TODO: Try to do better?
         inout->mulByUnknownColor();
     }