Fix visual bench memory leak

tools/VisualBench/VisualBenchmarkStream.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/VisualBenchmarkStream.h>
 #include "GMBench.h"
@@ skipping 50 matching lines @@
         SkDebugf("Could not read %s as an SkPicture.\n", path);
         return false;
     }
     return true;
 }
 
 Benchmark* VisualBenchmarkStream::next() {
     Benchmark* bench;
     // skips non matching benches
     while ((bench = this->innerNext()) &&
-           SkCommandLineFlags::ShouldSkip(FLAGS_match, bench->getUniqueName())) {
+           (SkCommandLineFlags::ShouldSkip(FLAGS_match, bench->getUniqueName()) ||
+            !bench->isSuitableFor(Benchmark::kGPU_Backend))) {
+        bench->unref();
     }
     return bench;
 }
 
 Benchmark* VisualBenchmarkStream::innerNext() {
     while (fBenches) {
         Benchmark* bench = fBenches->factory()(NULL);
         fBenches = fBenches->next();
         if (bench->isVisual()) {
             fSourceType = "bench";
             fBenchType  = "micro";
             return bench;
         }
+        bench->unref();
     }
 
     while (fGMs) {
         SkAutoTDelete<skiagm::GM> gm(fGMs->factory()(NULL));
         fGMs = fGMs->next();
         if (gm->runAsBench()) {
             fSourceType = "gm";
             fBenchType  = "micro";
             return SkNEW_ARGS(GMBench, (gm.detach()));
         }
     }
 
     // Render skps
     while (fCurrentSKP < fSKPs.count()) {
         const SkString& path = fSKPs[fCurrentSKP++];
         SkAutoTUnref<SkPicture> pic;
         if (!ReadPicture(path.c_str(), &pic)) {
             continue;
         }
 
         SkString name = SkOSPath::Basename(path.c_str());
         fSourceType = "skp";
         fBenchType = "playback";
         return SkNEW_ARGS(VisualSKPBench, (name.c_str(), pic.get()));
     }
 
     return NULL;
 }