new image from backend desc

src/image/SkImagePriv.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImagePriv_DEFINED
 #define SkImagePriv_DEFINED
 
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 static inline size_t SkImageMinRowBytes(const SkImageInfo& info) {
     return SkAlign4(info.minRowBytes());
 }
 
 // Given an image created from SkNewImageFromBitmap, return its pixelref. This
 // may be called to see if the surface and the image share the same pixelref,
 // in which case the surface may need to perform a copy-on-write.
 extern const SkPixelRef* SkBitmapImageGetPixelRef(const SkImage* rasterImage);
 
-// Given an image created with NewTexture, return its GrTexture. This
-// may be called to see if the surface and the image share the same GrTexture,
-// in which case the surface may need to perform a copy-on-write.
-extern GrTexture* SkTextureImageGetTexture(SkImage* textureImage);
-
 // When a texture is shared by a surface and an image its budgeted status is that of the
 // surface. This function is used when the surface makes a new texture for itself in order
 // for the orphaned image to determine whether the original texture counts against the
 // budget or not.
 extern void SkTextureImageApplyBudgetedDecision(SkImage* textureImage);
 
 // Update the texture wrapped by an image created with NewTexture. This
 // is called when a surface and image share the same GrTexture and the
 // surface needs to perform a copy-on-write
 extern void SkTextureImageSetTexture(SkImage* image, GrTexture* texture);
 
-extern SkImage* SkNewImageFromBitmapTexture(const SkBitmap&, int sampleCountForNewSurfaces,
-                                            SkSurface::Budgeted);
-
 #endif