Move GrInvariantOutput out of GrProcessor and into its own class.

src/gpu/effects/GrSingleTextureEffect.h

Index: src/gpu/effects/GrSingleTextureEffect.h
diff --git a/src/gpu/effects/GrSingleTextureEffect.h b/src/gpu/effects/GrSingleTextureEffect.h
index 836c54c234b8181a61dab097c9dff18fd1a3f473..efdf25555259d315cf66970f18daca472d4de8ce 100644
--- a/src/gpu/effects/GrSingleTextureEffect.h
+++ b/src/gpu/effects/GrSingleTextureEffect.h
@@ -9,8 +9,9 @@
 #define GrSingleTextureEffect_DEFINED
 
 #include "GrFragmentProcessor.h"
-#include "SkMatrix.h"
 #include "GrCoordTransform.h"
+#include "GrInvariantOutput.h"
+#include "SkMatrix.h"
 
 class GrTexture;
 
@@ -38,7 +39,7 @@ protected:
      * the subclass output color will be a modulation of the input color with a value read from the
      * texture.
      */
-    void updateInvariantOutputForModulation(InvariantOutput* inout) const {
+    void updateInvariantOutputForModulation(GrInvariantOutput* inout) const {
         if (GrPixelConfigIsOpaque(this->texture(0)->config())) {
             inout->mulByUnknownOpaqueColor();
         } else {