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

gm/verylargebitmap.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 "gm.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
@@ skipping 32 matching lines @@
     canvas->restore();
     canvas->drawRect(r, paint);
 
     r.offset(SkIntToScalar(150), 0);
     // exercises extract bitmap, but not shader
     canvas->drawBitmapRect(bm, ir, r, NULL);
     canvas->drawRect(r, paint);
 
     r.offset(SkIntToScalar(150), 0);
     // exercises bitmapshader
-    canvas->drawBitmapRect(bm, NULL, r, NULL);
+    canvas->drawBitmapRect(bm, r, nullptr);
     canvas->drawRect(r, paint);
 }
 
 class VeryLargeBitmapGM : public skiagm::GM {
 public:
     VeryLargeBitmapGM() {}
 
 protected:
     SkString onShortName() override {
         return SkString("verylargebitmap");
@@ skipping 36 matching lines @@
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new VeryLargeBitmapGM; }
 static skiagm::GMRegistry reg(MyFactory);