Revert[4] of add ImageShader, sharing code with its Bitmap cousin

src/gpu/GrTextureMaker.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
 
 #include "SkGrPriv.h"
 
 class GrContext;
 class GrTexture;
 class GrTextureParams;
 class GrUniqueKey;
 class SkBitmap;
 
 class GrTextureMaker {
 public:
     GrTextureMaker(int width, int height) : fWidth(width), fHeight(height) {}
     virtual ~GrTextureMaker() {}
 
     int width() const { return fWidth; }
     int height() const { return fHeight; }
 
+    GrTexture* refCachedTexture(GrContext*, SkImageUsageType);
     GrTexture* refCachedTexture(GrContext*, const GrTextureParams*);
 
 protected:
     /**
      *  Return the maker's "original" unstretched texture. It is the responsibility of the maker
      *  to make this efficient ... if the texture is being generated, the maker must handle
      *  caching it.
      */
     virtual GrTexture* onRefUnstretchedTexture(GrContext*) = 0;
 
@@ skipping 30 matching lines @@
      *  of the original texture.
      */
     virtual bool onGetROBitmap(SkBitmap*) = 0;
 
 private:
     const int fWidth;
     const int fHeight;
 };
 
 #endif