Replace uses of GR_DEBUG by SK_DEBUG.

src/gpu/GrTextureAccess.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextureAccess.h"
 #include "GrColor.h"
 #include "GrTexture.h"
 
 GrTextureAccess::GrTextureAccess() {
-#if GR_DEBUG
+#ifdef SK_DEBUG
     memcpy(fSwizzle, "void", 5);
     fSwizzleMask = 0xbeeffeed;
 #endif
 }
 
 GrTextureAccess::GrTextureAccess(GrTexture* texture, const GrTextureParams& params) {
     this->reset(texture, params);
 }
 
 GrTextureAccess::GrTextureAccess(GrTexture* texture,
@@ skipping 74 matching lines @@
                 break;
             case 'a':
                 fSwizzleMask |= kA_GrColorComponentFlag;
                 break;
             default:
                 GrCrash("Unexpected swizzle string character.");
                 break;
         }
     }
 }