simplify GrTextureAdjuster given there is only one subclass

src/gpu/GrTextureParamsAdjuster.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTextureMaker_DEFINED
 #define GrTextureMaker_DEFINED
 
@@ skipping 124 matching lines @@
 
     sk_sp<GrFragmentProcessor> createFragmentProcessor(
                                 const SkMatrix& textureMatrix,
                                 const SkRect& constraintRect,
                                 FilterConstraint,
                                 bool coordsLimitedToConstraintRect,
                                 const GrTextureParams::FilterMode* filterOrNullForBicubic,
                                 SkColorSpace* dstColorSpace,
                                 SkSourceGammaTreatment) override;
 
+    // We do not ref the texture nor the colorspace, so the caller must keep them in scope while
+    // this Adjuster is alive.
+    GrTextureAdjuster(GrTexture*, const SkIRect& area, uint32_t uniqueID, SkColorSpace*);
+
 protected:
-    /** The whole texture is content. */
-    explicit GrTextureAdjuster(GrTexture* original, bool isAlphaOnly)
-        : INHERITED(original->width(), original->height(), isAlphaOnly)
-        , fOriginal(original) {}
-
-    GrTextureAdjuster(GrTexture* original, const SkIRect& contentArea, bool isAlphaOnly);
+    SkColorSpace* getColorSpace() override;
+    void makeCopyKey(const CopyParams& params, GrUniqueKey* copyKey) override;
+    void didCacheCopy(const GrUniqueKey& copyKey) override;
 
     GrTexture* originalTexture() const { return fOriginal; }
 
     /** Returns the content area or null for the whole original texture */
     const SkIRect* contentAreaOrNull() { return fContentArea.getMaybeNull(); }
 
 private:
     SkTLazy<SkIRect>    fContentArea;
     GrTexture*          fOriginal;
+    SkColorSpace*       fColorSpace;
+    uint32_t            fUniqueID;
 
     GrTexture* refCopy(const CopyParams &copyParams);
 
     typedef GrTextureProducer INHERITED;
 };
 
 /**
  * Base class for sources that start out as something other than a texture (encoded image,
  * picture, ...).
  */
@@ skipping 39 matching lines @@
 
     GrContext* context() const { return fContext; }
 
 private:
     GrContext*  fContext;
 
     typedef GrTextureProducer INHERITED;
 };
 
 #endif