add some debugging to SkNVRefCnt

bench/PicturePlaybackBench.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "Benchmark.h"
 #include "SkCanvas.h"
 #include "SkColor.h"
 #include "SkPaint.h"
@@ skipping 192 matching lines @@
                                   break;
                 }
                 SkAutoCanvasRestore ar(canvas, true/*save now*/);
                 canvas->clipRect(SkRect::MakeXYWH(x,y,256,256));
                 fPic->playback(canvas);
             }
         }
     }
 
 private:
-    BBH                      fBBH;
-    Mode                     fMode;
-    SkString                 fName;
-    SkAutoTDelete<SkPicture> fPic;
+    BBH                     fBBH;
+    Mode                    fMode;
+    SkString                fName;
+    SkAutoTUnref<SkPicture> fPic;
 };
 
 DEF_BENCH( return new TiledPlaybackBench(kNone,     kRandom); )
 DEF_BENCH( return new TiledPlaybackBench(kNone,     kTiled ); )
 DEF_BENCH( return new TiledPlaybackBench(kRTree,    kRandom); )
 DEF_BENCH( return new TiledPlaybackBench(kRTree,    kTiled ); )
 DEF_BENCH( return new TiledPlaybackBench(kTileGrid, kRandom); )
 DEF_BENCH( return new TiledPlaybackBench(kTileGrid, kTiled ); )