Measure picture recording speed in nanobench.

bench/RecordingBench.h

Index: bench/RecordingBench.h
diff --git a/bench/RecordingBench.h b/bench/RecordingBench.h
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+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef RecordingBench_DEFINED
+#define RecordingBench_DEFINED
+
+#include "Benchmark.h"
+#include "SkPicture.h"
+
+class RecordingBench : public Benchmark {
+public:
+    RecordingBench(const char* name, const SkPicture*, bool useBBH);
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE;
+    virtual bool isSuitableFor(Backend) SK_OVERRIDE;
+    virtual void onDraw(const int loops, SkCanvas*) SK_OVERRIDE;
+    virtual SkIPoint onGetSize() SK_OVERRIDE;
+
+private:
+    SkAutoTUnref<const SkPicture> fSrc;
+    SkString fName;
+    bool fUseBBH;
+
+    typedef Benchmark INHERITED;
+};
+
+#endif//RecordingBench_DEFINED