Allow benchmarks to specify running multiple metrics.

tracing/tracing/metrics/sample_metric.html

Index: tracing/tracing/metrics/sample_metric.html
diff --git a/tracing/tracing/metrics/sample_metric.html b/tracing/tracing/metrics/sample_metric.html
index 43ae5dae567dc833ef58bede398ba61fd27f942d..cd3209e1127d7949dbb8bac98420151a6cc26824 100644
--- a/tracing/tracing/metrics/sample_metric.html
+++ b/tracing/tracing/metrics/sample_metric.html
@@ -29,10 +29,22 @@ tr.exportTo('tr.metrics', function() {
     values.addValue(new tr.v.NumericValue('baz', n3));
   }
 
+  function sampleMetricTwo(values, model) {
+    var n1 = new tr.v.ScalarNumeric(sizeInBytes_smallerIsBetter, 1);

[charliea (OOO until 10-5), 2016/07/06 19:52:41]

nit: these are really bad variable names

[alexandermont, 2016/07/06 20:06:56]

These are the same names that were there earlier in sampleMetric. This is just a
sample metric that gets used for tests, and I just made a "sampleMetric2" to be
able to run a test (in metric_map_function_test) with two metrics.

+    var n2 = new tr.v.ScalarNumeric(sizeInBytes_smallerIsBetter, 2);
+    var n3 = SIZE_NUMERIC_BUILDER.build();
+    n3.add(1);
+    values.addValue(new tr.v.NumericValue('one', n1));
+    values.addValue(new tr.v.NumericValue('two', n2));
+    values.addValue(new tr.v.NumericValue('three', n3));
+  }
+
   tr.metrics.MetricRegistry.register(sampleMetric);
+  tr.metrics.MetricRegistry.register(sampleMetricTwo);
 
   return {
-    sampleMetric: sampleMetric
+    sampleMetric: sampleMetric,
+    sampleMetricTwo: sampleMetricTwo
   };
 });
 </script>