Move GrInvariantOutput out of GrProcessor and into its own class.

src/gpu/effects/GrSingleTextureEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSingleTextureEffect_DEFINED
 #define GrSingleTextureEffect_DEFINED
 
 #include "GrFragmentProcessor.h"
+#include "GrCoordTransform.h"
+#include "GrInvariantOutput.h"
 #include "SkMatrix.h"
-#include "GrCoordTransform.h"
 
 class GrTexture;
 
 /**
  * A base class for effects that draw a single texture with a texture matrix. This effect has no
  * backend implementations. One must be provided by the subclass.
  */
 class GrSingleTextureEffect : public GrFragmentProcessor {
 public:
     virtual ~GrSingleTextureEffect();
 
 protected:
     /** unfiltered, clamp mode */
     GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrCoordSet = kLocal_GrCoordSet);
     /** clamp mode */
     GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrTextureParams::FilterMode filterMode,
                           GrCoordSet = kLocal_GrCoordSet);
     GrSingleTextureEffect(GrTexture*,
                           const SkMatrix&,
                           const GrTextureParams&,
                           GrCoordSet = kLocal_GrCoordSet);
 
     /**
      * Can be used as a helper to implement subclass onComputeInvariantOutput(). It assumes that
      * 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 {
             inout->mulByUnknownColor();
         }
     }
 
 private:
     GrCoordTransform fCoordTransform;
     GrTextureAccess  fTextureAccess;
 
     typedef GrFragmentProcessor INHERITED;
 };
 
 #endif