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

src/core/SkImageCacherator.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 SkImageCacherator_DEFINED
 #define SkImageCacherator_DEFINED
 
@@ skipping 40 matching lines @@
      *  If the underlying src naturally is represented by an encoded blob (in SkData), this returns
      *  a ref to that data. If not, it returns null.
      */
     SkData* refEncoded();
 
 private:
     SkImageCacherator(SkImageGenerator*, const SkImageInfo&, const SkIPoint&, uint32_t uniqueID);
 
     bool generateBitmap(SkBitmap*);
     bool tryLockAsBitmap(SkBitmap*, const SkImage*);
+#if SK_SUPPORT_GPU
+    GrTexture* lockUnstretchedTexture(GrContext*, SkImageUsageType, const SkImage* client);
+#endif
 
     class ScopedGenerator {
         SkImageCacherator* fCacher;
     public:
         ScopedGenerator(SkImageCacherator* cacher) : fCacher(cacher) {
             fCacher->fMutexForGenerator.acquire();
         }
         ~ScopedGenerator() {
             fCacher->fMutexForGenerator.release();
         }
         SkImageGenerator* operator->() const { return fCacher->fNotThreadSafeGenerator; }
         operator SkImageGenerator*() const { return fCacher->fNotThreadSafeGenerator; }
     };
 
     SkMutex                         fMutexForGenerator;
     SkAutoTDelete<SkImageGenerator> fNotThreadSafeGenerator;
 
     const SkImageInfo   fInfo;
     const SkIPoint      fOrigin;
     const uint32_t      fUniqueID;
+
+    friend class Cacherator_GrTextureMaker;
 };
 
 #endif