Define DiagnosticMap and a basic Diagnostic hierarchy

tracing/tracing/ui/analysis/single_user_expectation_sub_view.html

Index: tracing/tracing/ui/analysis/single_user_expectation_sub_view.html
diff --git a/tracing/tracing/ui/analysis/single_user_expectation_sub_view.html b/tracing/tracing/ui/analysis/single_user_expectation_sub_view.html
index 46f688937dd6c90baa449df5d9ebfbb156dc3cec..96d2842ae167cda06971137f4d909e6c1c5db76b 100644
--- a/tracing/tracing/ui/analysis/single_user_expectation_sub_view.html
+++ b/tracing/tracing/ui/analysis/single_user_expectation_sub_view.html
@@ -67,43 +67,6 @@ found in the LICENSE file.
     onCustomizeRows_: function(event) {
       var ue = tr.b.getOnlyElement(this.selection);
 
-      var values = new tr.metrics.ValueSet();
-
-      function runMetric(metricInfo) {
-        try {
-          metricInfo.constructor(values, ue.parentModel);
-        } catch (failure) {
-          console.error(metricInfo, failure);
-        }
-      }
-
-      tr.metrics.MetricRegistry.getAllRegisteredTypeInfos().forEach(runMetric);
-
-      // Metrics may have been computed more than once, so avoid displaying them
-      // more than once by collecting them in a dictionary.
-      // https://github.com/catapult-project/catapult/issues/2154
-      var metricValues = {};
-
-      values.valueDicts.forEach(function(value) {
-        if (value.grouping_keys.userExpectationStableId !== ue.stableId)
-          return;
-
-        if ((value.type !== 'numeric') ||
-            (value.numeric.type !== 'scalar'))
-          return;
-
-        metricValues[value.grouping_keys.name] = value.numeric;
-      });
-
-      for (var name in metricValues) {
-        event.rows.push({
-          name: name,
-          value: tr.v.ui.createScalarSpan(metricValues[name].value, {
-            unit: tr.v.Unit.fromJSON(metricValues[name].unit)
-          })
-        });
-      }
-
       if (ue.rawCpuMs) {
         event.rows.push({
           name: 'Total CPU',