Introduce GrColorSpaceXform, for gamut conversion on textures

include/gpu/GrTextureAccess.h

Index: include/gpu/GrTextureAccess.h
diff --git a/include/gpu/GrTextureAccess.h b/include/gpu/GrTextureAccess.h
index 1b5de0ce99cc1f4e162820c03df288bce6f0f939..cf8be9a319a2a1c2dd328ed5671b0021c526a58e 100644
--- a/include/gpu/GrTextureAccess.h
+++ b/include/gpu/GrTextureAccess.h
@@ -8,6 +8,7 @@
 #ifndef GrTextureAccess_DEFINED
 #define GrTextureAccess_DEFINED
 
+#include "GrColorSpaceXform.h"
 #include "GrGpuResourceRef.h"
 #include "GrTexture.h"
 #include "GrTextureParams.h"
@@ -25,16 +26,16 @@ public:
      */
     GrTextureAccess();
 
-    GrTextureAccess(GrTexture*, const GrTextureParams&);
+    GrTextureAccess(GrTexture*, sk_sp<GrColorSpaceXform> colorSpaceXform, const GrTextureParams&);
 
-    explicit GrTextureAccess(GrTexture*,
+    explicit GrTextureAccess(GrTexture*, sk_sp<GrColorSpaceXform> colorSpaceXform,
                              GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
                              SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode,
                              GrShaderFlags visibility = kFragment_GrShaderFlag);
 
-    void reset(GrTexture*, const GrTextureParams&,
+    void reset(GrTexture*, sk_sp<GrColorSpaceXform> colorSpaceXform, const GrTextureParams&,
                GrShaderFlags visibility = kFragment_GrShaderFlag);
-    void reset(GrTexture*,
+    void reset(GrTexture*, sk_sp<GrColorSpaceXform> colorSpaceXform,
                GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
                SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode,
                GrShaderFlags visibility = kFragment_GrShaderFlag);
@@ -42,13 +43,15 @@ public:
     bool operator==(const GrTextureAccess& that) const {
         return this->getTexture() == that.getTexture() &&
                fParams == that.fParams &&
-               fVisibility == that.fVisibility;
+               fVisibility == that.fVisibility &&
+               fColorSpaceXform == that.fColorSpaceXform;
     }
 
     bool operator!=(const GrTextureAccess& other) const { return !(*this == other); }
 
     GrTexture* getTexture() const { return fTexture.get(); }
     GrShaderFlags getVisibility() const { return fVisibility; }
+    GrColorSpaceXform* getColorSpaceXform() const { return fColorSpaceXform.get(); }
 
     /**
      * For internal use by GrProcessor.
@@ -64,6 +67,7 @@ private:
     ProgramTexture                  fTexture;
     GrTextureParams                 fParams;
     GrShaderFlags                   fVisibility;
+    sk_sp<GrColorSpaceXform>        fColorSpaceXform;
 
     typedef SkNoncopyable INHERITED;
 };