Fix label sorting in results.html

tracing/tracing/value/histogram_parameter_collector.html

Index: tracing/tracing/value/histogram_parameter_collector.html
diff --git a/tracing/tracing/value/histogram_parameter_collector.html b/tracing/tracing/value/histogram_parameter_collector.html
index 5be74254ba1b72d17c2dd9d414a8232868a809f6..3e7738ba1ea0973046a3974fe8a059cad4299db1 100644
--- a/tracing/tracing/value/histogram_parameter_collector.html
+++ b/tracing/tracing/value/histogram_parameter_collector.html
@@ -64,8 +64,11 @@ tr.exportTo('tr.v', function() {
         }
         const displayLabel = getDisplayLabel(hist);
 
-        this.labelsToStartTimes_.set(displayLabel, Math.min(
-            startTime, this.labelsToStartTimes_.get(displayLabel, 0)));
+        if (this.labelsToStartTimes_.has(displayLabel)) {
+          startTime = Math.min(startTime,
+              this.labelsToStartTimes_.get(displayLabel));
+        }
+        this.labelsToStartTimes_.set(displayLabel, startTime);
 
         if (!telemetry) continue;