Have nanobench report bench median sample time too.

bench/nanobench.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <ctype.h>
 
 #include "nanobench.h"
@@ skipping 1154 matching lines @@
                 cleanup_run(target);
                 continue;
             }
 
             Stats stats(samples);
             log->config(config);
             log->configOption("name", bench->getName());
             benchStream.fillCurrentOptions(log.get());
             target->fillOptions(log.get());
             log->metric("min_ms",    stats.min);
+            log->metric("median_ms", stats.median);
 #if SK_SUPPORT_GPU
             if (gpuStatsDump) {
                 // dump to json, only SKPBench currently returns valid keys / values
                 SkASSERT(keys.count() == values.count());
                 for (int i = 0; i < keys.count(); i++) {
                     log->metric(keys[i].c_str(), values[i]);
                 }
             }
 #endif
 
@@ skipping 67 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif