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

tests/RecorderTest.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 
 #include "SkPictureRecorder.h"
@@ skipping 80 matching lines @@
 
         REPORTER_ASSERT(reporter, 1 == tally.count<SkRecords::DrawImage>());
     }
     REPORTER_ASSERT(reporter, image->unique());
 
     {
         SkRecord record;
         SkRecorder recorder(&record, 100, 100);
 
         // DrawImageRect is supposed to take a reference
-        recorder.drawImageRect(image.get(), 0, SkRect::MakeWH(100, 100));
+        recorder.drawImageRect(image.get(), SkRect::MakeWH(100, 100), nullptr);
         REPORTER_ASSERT(reporter, !image->unique());
 
         Tally tally;
         tally.apply(record);
 
         REPORTER_ASSERT(reporter, 1 == tally.count<SkRecords::DrawImageRect>());
     }
     REPORTER_ASSERT(reporter, image->unique());
 }