flag to use const& instead of const* for src-rect

gm/bigtileimagefilter.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapSource.h"
 #include "SkTileImageFilter.h"
 #include "gm.h"
@@ skipping 66 matching lines @@
                             NULL));
             p2.setImageFilter(tif2);
 
             canvas->translate(320, 320);
             canvas->saveLayer(&bound2, &p2);
             canvas->setMatrix(SkMatrix::I());
 
             SkRect bound3 = SkRect::MakeXYWH(320, 320,
                                              SkIntToScalar(kBitmapSize),
                                              SkIntToScalar(kBitmapSize));
-            canvas->drawBitmapRect(fGreenBitmap, &bound2, bound3, NULL,
+            canvas->drawBitmapRect(fGreenBitmap, bound2, bound3, nullptr,
                                    SkCanvas::kStrict_SrcRectConstraint);
             canvas->restore();
         }
     }
 
 private:
     static const int kWidth = 512;
     static const int kHeight = 512;
     static const int kBitmapSize = 64;
 
     SkBitmap fRedBitmap;
     SkBitmap fGreenBitmap;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return SkNEW(BigTileImageFilterGM); )
 
 }