Fix leak in PictureNestingBench

bench/PictureNestingBench.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 "Benchmark.h"
 #include "SkCanvas.h"
 #include "SkColor.h"
 #include "SkNullCanvas.h"
 #include "SkPaint.h"
 #include "SkPicture.h"
 #include "SkPictureRecorder.h"
 #include "SkString.h"
 
 class PictureNesting : public Benchmark {
 public:
     PictureNesting(const char* name, int maxLevel, int maxPictureLevel)
         : fMaxLevel(maxLevel)
         , fMaxPictureLevel(maxPictureLevel) {
 
         fPaint.setColor(SK_ColorRED);
         fPaint.setAntiAlias(true);
         fPaint.setStyle(SkPaint::kStroke_Style);
-        fName.printf("picture_nesting_%s_%d", name,
-                     this->sierpinsky(SkCreateNullCanvas(), 0, fPaint));
+        SkAutoTUnref<SkCanvas> nullCanvas(SkCreateNullCanvas());

[tfarina, 2014/09/17 16:42:34]

looks right, since nothing in sierpinsky() takes ownership of the created
SkCanvas.

+        fName.printf("picture_nesting_%s_%d", name, this->sierpinsky(nullCanvas, 0, fPaint));
     }
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         return fName.c_str();
     }
 
     void doDraw(SkCanvas* canvas) {
         SkIPoint canvasSize = onGetSize();
         canvas->save();
@@ skipping 116 matching lines @@
 
 DEF_BENCH( return new PictureNestingPlayback(8, 0); )
 DEF_BENCH( return new PictureNestingPlayback(8, 1); )
 DEF_BENCH( return new PictureNestingPlayback(8, 2); )
 DEF_BENCH( return new PictureNestingPlayback(8, 3); )
 DEF_BENCH( return new PictureNestingPlayback(8, 4); )
 DEF_BENCH( return new PictureNestingPlayback(8, 5); )
 DEF_BENCH( return new PictureNestingPlayback(8, 6); )
 DEF_BENCH( return new PictureNestingPlayback(8, 7); )
 DEF_BENCH( return new PictureNestingPlayback(8, 8); )