[Telemetry] Update the ConfindenceInterval calculation in results.html to use

tools/telemetry/support/html_output/results-template.html

Index: tools/telemetry/support/html_output/results-template.html
diff --git a/tools/telemetry/support/html_output/results-template.html b/tools/telemetry/support/html_output/results-template.html
index b79812da31793b742fd6a949a8bdbfe345af0da9..7487d9025631f94b0080e7674e23d5385d4ad537 100644
--- a/tools/telemetry/support/html_output/results-template.html
+++ b/tools/telemetry/support/html_output/results-template.html
@@ -279,7 +279,7 @@ var PADDING_UNDER_GRAPH = 5;
 // px Indentation for nested children left-margins
 var INDENTATION = 40;
 
-function TestResult(metric, values, associatedRun) {
+function TestResult(metric, values, associatedRun, std, degreesOfFreedom) {
     if (values) {
         if (values[0] instanceof Array) {
             var flattenedValues = [];
@@ -321,6 +321,10 @@ function TestResult(metric, values, associatedRun) {
     this.min = function () { return metric.scalingFactor() * Statistics.min(values); }
     this.max = function () { return metric.scalingFactor() * Statistics.max(values); }
     this.confidenceIntervalDelta = function () {
+        if (std !== undefined) {
+            return metric.scalingFactor() * Statistics.confidenceIntervalDeltaFromStd(0.95, values.length,

[Yuta Kitamura, 2015/09/28 04:32:37]

On my environment, I consistently see the following error,
preventing the results from getting shown:
Seems like confidenceIntervalDeltaFromStd is not defined.
At least there's none in
third_party/WebKit/PerformanceTests/resources/statistics.js.

Can you fix this?

[nednguyen, 2015/09/28 15:33:23]

I cannot reproduce this error (see http://imgur.com/A6DYJBL). This is really
strange, can you check
src/tools/telemetry/third_party/WebKit/PerformanceTests/resources/statistics.js
which is the one telemetry uses?

+                std, degreesOfFreedom);
+        }
         return metric.scalingFactor() * Statistics.confidenceIntervalDelta(0.95, values.length,
             Statistics.sum(values), Statistics.squareSum(values));
     }
@@ -1359,7 +1363,10 @@ function init() {
                         metric = new PerfTestMetric(testName, metricName, rawMetrics[metricName].units, rawMetrics[metricName].important);
                         metrics[fullMetricName] = metric;
                     }
-                    metric.addResult(new TestResult(metric, rawMetrics[metricName].current, run));
+                    // std & degrees_of_freedom could be undefined
+                    metric.addResult(
+                        new TestResult(metric, rawMetrics[metricName].current,
+                            run, rawMetrics[metricName].['std'], rawMetrics[metricName]['degrees_of_freedom']));
                 }
             }
         }