Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/effects/GrConfigConversionEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrConfigConversionEffect.h"
 #include "GrContext.h"
 #include "GrDrawContext.h"
@@ skipping 80 matching lines @@
     typedef GrGLSLFragmentProcessor INHERITED;
 
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrConfigConversionEffect::GrConfigConversionEffect(GrTexture* texture,
                                                    const GrSwizzle& swizzle,
                                                    PMConversion pmConversion,
                                                    const SkMatrix& matrix)
-    : INHERITED(texture, matrix)
+    : INHERITED(texture, nullptr, matrix)
     , fSwizzle(swizzle)
     , fPMConversion(pmConversion) {
     this->initClassID<GrConfigConversionEffect>();
     // We expect to get here with non-BGRA/RGBA only if we're doing not doing a premul/unpremul
     // conversion.
     SkASSERT((kRGBA_8888_GrPixelConfig == texture->config() ||
               kBGRA_8888_GrPixelConfig == texture->config()) ||
               kNone_PMConversion == pmConversion);
     // Why did we pollute our texture cache instead of using a GrSingleTextureEffect?
     SkASSERT(swizzle != GrSwizzle::RGBA() || kNone_PMConversion != pmConversion);
@@ skipping 177 matching lines @@
 }
 
 sk_sp<GrFragmentProcessor> GrConfigConversionEffect::Make(GrTexture* texture,
                                                           const GrSwizzle& swizzle,
                                                           PMConversion pmConversion,
                                                           const SkMatrix& matrix) {
     if (swizzle == GrSwizzle::RGBA() && kNone_PMConversion == pmConversion) {
         // If we returned a GrConfigConversionEffect that was equivalent to a GrSimpleTextureEffect
         // then we may pollute our texture cache with redundant shaders. So in the case that no
         // conversions were requested we instead return a GrSimpleTextureEffect.
-        return GrSimpleTextureEffect::Make(texture, matrix);
+        return GrSimpleTextureEffect::Make(texture, nullptr, matrix);
     } else {
         if (kRGBA_8888_GrPixelConfig != texture->config() &&
             kBGRA_8888_GrPixelConfig != texture->config() &&
             kNone_PMConversion != pmConversion) {
             // The PM conversions assume colors are 0..255
             return nullptr;
         }
         return sk_sp<GrFragmentProcessor>(
             new GrConfigConversionEffect(texture, swizzle, pmConversion, matrix));
     }
 }