Add color gamut xform helpers to GrGLSLShaderBuilder

src/image/SkImageShader.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcShader.h"
 #include "SkBitmapProvider.h"
 #include "SkColorShader.h"
@@ skipping 196 matching lines @@
     GrTextureParams::FilterMode textureFilterMode =
     GrSkFilterQualityToGrFilterMode(args.fFilterQuality, *args.fViewMatrix, this->getLocalMatrix(),
                                     &doBicubic);
     GrTextureParams params(tm, textureFilterMode);
     SkAutoTUnref<GrTexture> texture(as_IB(fImage)->asTextureRef(args.fContext, params,
                                                                 args.fGammaTreatment));
     if (!texture) {
         return nullptr;
     }
 
+    SkImageInfo info = as_IB(fImage)->onImageInfo();
+    sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(info.colorSpace(),
+                                                                       args.fDstColorSpace,
+                                                                       info.alphaType());
     sk_sp<GrFragmentProcessor> inner;
     if (doBicubic) {
-        inner = GrBicubicEffect::Make(texture, nullptr, matrix, tm);
+        inner = GrBicubicEffect::Make(texture, std::move(colorSpaceXform), matrix, tm);
     } else {
-        inner = GrSimpleTextureEffect::Make(texture, nullptr, matrix, params);
+        inner = GrSimpleTextureEffect::Make(texture, std::move(colorSpaceXform), matrix, params);
     }
 
     if (GrPixelConfigIsAlphaOnly(texture->config())) {
         return inner;
     }
     return sk_sp<GrFragmentProcessor>(GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)));
 }
 
 #endif
 
@@ skipping 20 matching lines @@
     SkShader::TileMode mx = (SkShader::TileMode)buffer.readUInt();
     SkShader::TileMode my = (SkShader::TileMode)buffer.readUInt();
     return image ? image->makeShader(mx, my, &lm) : nullptr;
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkShader)
 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkImageShader)
 SkFlattenable::Register("SkBitmapProcShader", SkBitmapProcShader_CreateProc, kSkShader_Type);
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END