Add specialized content key class for resources.

include/gpu/GrTexture.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTexture_DEFINED
 #define GrTexture_DEFINED
 
 #include "GrSurface.h"
 #include "SkPoint.h"
 #include "SkRefCnt.h"
 
-class GrResourceKey;
 class GrTextureParams;
 class GrTexturePriv;
 
 class GrTexture : virtual public GrSurface {
 public:
     GrTexture* asTexture() SK_OVERRIDE { return this; }
     const GrTexture* asTexture() const SK_OVERRIDE { return this; }
 
     /**
      *  Return the native ID or handle to the texture, depending on the
@@ skipping 77 matching lines @@
         fTexture.reset(SkSafeRef(texture));
         return texture;
     }
 
 private:
     SkAutoTUnref<GrTexture> fTexture;
     SkIPoint                fOffset;
 };
 
 #endif