Create fragment processor for performing input color blend with child processor

src/gpu/effects/GrSimpleTextureEffect.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSimpleTextureEffect_DEFINED
 #define GrSimpleTextureEffect_DEFINED
 
 #include "GrSingleTextureEffect.h"
 
 class GrInvariantOutput;
 
 /**
  * The output color of this effect is a modulation of the input color and a sample from a texture.
  * It allows explicit specification of the filtering and wrap modes (GrTextureParams). It can use
- * local coords, positions, or a custom vertex attribute as input texture coords. The input coords
- * can have a matrix applied in the VS in both the local and position cases but not with a custom
- * attribute coords at this time. It will add a varying to input interpolate texture coords to the
- * FS.
+ * local coords or device space coords as input texture coords. The input coords may be transformed
+ * by a matrix.
  */
 class GrSimpleTextureEffect : public GrSingleTextureEffect {
 public:
     /* unfiltered, clamp mode */
-    static GrFragmentProcessor* Create(GrProcessorDataManager* procDataManager,
-                                       GrTexture* tex,
-                                       const SkMatrix& matrix,
-                                       GrCoordSet coordSet = kLocal_GrCoordSet) {
+    static const GrFragmentProcessor* Create(GrProcessorDataManager* procDataManager,
+                                             GrTexture* tex,
+                                             const SkMatrix& matrix,
+                                             GrCoordSet coordSet = kLocal_GrCoordSet) {
         return new GrSimpleTextureEffect(procDataManager, tex, matrix,
                                          GrTextureParams::kNone_FilterMode, coordSet);
     }
 
     /* clamp mode */
     static GrFragmentProcessor* Create(GrProcessorDataManager* procDataManager,
                                        GrTexture* tex,
                                        const SkMatrix& matrix,
                                        GrTextureParams::FilterMode filterMode,
                                        GrCoordSet coordSet = kLocal_GrCoordSet) {
@@ skipping 38 matching lines @@
     bool onIsEqual(const GrFragmentProcessor& other) const override { return true; }
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif