Register metric Histogram names.

tracing/tracing/metrics/metric_registry_test.html

Index: tracing/tracing/metrics/metric_registry_test.html
diff --git a/tracing/tracing/metrics/metric_registry_test.html b/tracing/tracing/metrics/metric_registry_test.html
index 135f2518a8b34db1f8a5dd2b1b67d98a9f4ff459..c176f60142af8804952960eb98887e3cc3e9def7 100644
--- a/tracing/tracing/metrics/metric_registry_test.html
+++ b/tracing/tracing/metrics/metric_registry_test.html
@@ -19,7 +19,9 @@ tr.b.unittest.testSuite(function() {
       n1.addSample(1);
       values.addHistogram(n1);
     }
-    tr.metrics.MetricRegistry.register(sampleMetricA);
+    tr.metrics.MetricRegistry.register(sampleMetricA, {
+      histogramNames: new Set([]),
+    });
 
     function sampleMetricB(values, model) {
       var n1 = new tr.v.Histogram('foo', tr.b.Unit.byName.count);
@@ -29,7 +31,9 @@ tr.b.unittest.testSuite(function() {
       values.addHistogram(n1);
       values.addHistogram(n2);
     }
-    tr.metrics.MetricRegistry.register(sampleMetricB);
+    tr.metrics.MetricRegistry.register(sampleMetricB, {
+      histogramNames: new Set([]),
+    });
 
     function sampleMetricC(values, model) {
       var n1 = new tr.v.Histogram('foo', tr.b.Unit.byName.count);
@@ -42,7 +46,9 @@ tr.b.unittest.testSuite(function() {
       values.addHistogram(n2);
       values.addHistogram(n3);
     }
-    tr.metrics.MetricRegistry.register(sampleMetricC);
+    tr.metrics.MetricRegistry.register(sampleMetricC, {
+      histogramNames: new Set([]),
+    });
 
     var typeInfo = tr.metrics.MetricRegistry.findTypeInfoWithName(
         'sampleMetricB');
@@ -61,6 +67,11 @@ tr.b.unittest.testSuite(function() {
     assert.throws(function() {
       tr.metrics.MetricRegistry.register(function(a) {});
     });
+
+    assert.throws(function() {
+      tr.metrics.MetricRegistry.register(function(histograms, model) {
+      });
+    });
   });
 });
 </script>