Add JSON output option to bench.

include/utils/SkJSONCPP.h

Index: include/utils/SkJSONCPP.h
===================================================================
--- include/utils/SkJSONCPP.h	(revision 0)
+++ include/utils/SkJSONCPP.h	(revision 0)
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * A common place to put the jsoncpp library includes, as opposed to littering
+ * the pragmas repeatedly through our code.
+ */
+#ifndef SkJSONCPP_DEFINED
+#define SkJSONCPP_DEFINED
+
+#ifdef SK_BUILD_FOR_WIN
+    // json includes xlocale which generates warning 4530 because we're
+    // compiling without exceptions;
+    // see https://code.google.com/p/skia/issues/detail?id=1067
+    #pragma warning(push)
+    #pragma warning(disable : 4530)
+#endif
+#include "json/reader.h"
+#include "json/value.h"
+#ifdef SK_BUILD_FOR_WIN
+    #pragma warning(pop)
+#endif
+
+#endif