Cleanup timing state machine

BUG=skia:

Review URL: https://codereview.chromium.org/1386933002
diff --git a/tools/VisualBench/VisualLightweightBenchModule.h b/tools/VisualBench/VisualLightweightBenchModule.h
index ffa109d..3538a48 100644
--- a/tools/VisualBench/VisualLightweightBenchModule.h
+++ b/tools/VisualBench/VisualLightweightBenchModule.h
@@ -47,6 +47,7 @@
     SkAutoTDelete<VisualBenchmarkStream> fBenchmarkStream;
     SkAutoTUnref<Benchmark> fBenchmark;
     TimingStateMachine fTSM;
+    bool fHasBeenReset;
 
     // support framework
     SkAutoTUnref<VisualBench> fOwner;