Fix visual bench memory leak

tools/VisualBench/VisualBench.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 "VisualBench.h"
 
@@ skipping 145 matching lines @@
                  stdDevPercent,
                  shortName);
     }
 }
 
 bool VisualBench::advanceRecordIfNecessary(SkCanvas* canvas) {
     if (fBenchmark) {
         return true;
     }
 
-    while ((fBenchmark = fBenchmarkStream->next()) &&
-           (SkCommandLineFlags::ShouldSkip(FLAGS_match, fBenchmark->getUniqueName()) ||
-            !fBenchmark->isSuitableFor(Benchmark::kGPU_Backend))) {}
-
+    fBenchmark.reset(fBenchmarkStream->next());
     if (!fBenchmark) {
         return false;
     }
 
     canvas->clear(0xffffffff);
     fBenchmark->preDraw();
     fBenchmark->perCanvasPreDraw(canvas);
     fRecords.push_back();
     return true;
 }
@@ skipping 51 matching lines @@
         }
         case kTiming_State: {
             if (fCurrentFrame >= FLAGS_frames) {
                 fTimer.end();
                 fRecords.back().fMeasurements.push_back(
                         fTimer.fWall / (FLAGS_frames * fLoops * fFlushes));
                 if (fCurrentSample++ >= FLAGS_samples) {
                     fState = kPreWarmLoops_State;
                     this->printStats();
                     fBenchmark->perCanvasPostDraw(canvas);
-                    fBenchmark = NULL;
+                    fBenchmark.reset(NULL);
                     fCurrentSample = 0;
                     fFlushes = 1;
                     fLoops = 1;
                 } else {
                     fState = kPreWarmTiming_State;
                 }
                 fTimer = WallTimer();
                 this->resetContext();
                 fCurrentFrame = 0;
             } else {
@@ skipping 23 matching lines @@
 
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }
 
 SkOSWindow* create_sk_window(void* hwnd, int argc, char** argv) {
     return new VisualBench(hwnd, argc, argv);
 }