Integrating SkSurface with SkDeferredCanvas

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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 // 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 SkPixelRef* SkBitmapImageGetPixelRef(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* rasterImage);
 
-// 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);
-
 #endif