Introduce GrColorSpaceXform, for gamut conversion on textures

src/effects/SkMagnifierImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMagnifierImageFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 50 matching lines @@
 
 private:
     GrMagnifierEffect(GrTexture* texture,
                       const SkRect& bounds,
                       float xOffset,
                       float yOffset,
                       float xInvZoom,
                       float yInvZoom,
                       float xInvInset,
                       float yInvInset)
-        : INHERITED(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
+        : INHERITED(texture, nullptr, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
         , fBounds(bounds)
         , fXOffset(xOffset)
         , fYOffset(yOffset)
         , fXInvZoom(xInvZoom)
         , fYInvZoom(yInvZoom)
         , fXInvInset(xInvInset)
         , fYInvInset(yInvInset) {
         this->initClassID<GrMagnifierEffect>();
     }
 
@@ skipping 332 matching lines @@
 
 #ifndef SK_IGNORE_TO_STRING
 void SkMagnifierImageFilter::toString(SkString* str) const {
     str->appendf("SkMagnifierImageFilter: (");
     str->appendf("src: (%f,%f,%f,%f) ",
                  fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom);
     str->appendf("inset: %f", fInset);
     str->append(")");
 }
 #endif