Create and display "comparison statistics" to compare two statistics

tools/telemetry/telemetry/page/html_page_measurement_results.py

Index: tools/telemetry/telemetry/page/html_page_measurement_results.py
diff --git a/tools/telemetry/telemetry/page/html_page_measurement_results.py b/tools/telemetry/telemetry/page/html_page_measurement_results.py
index a0b8b552322d1d7e8862c7d33885b060fd5b87eb..286ac237d69389c4aa46e53241529e6f3b0e2c2f 100644
--- a/tools/telemetry/telemetry/page/html_page_measurement_results.py
+++ b/tools/telemetry/telemetry/page/html_page_measurement_results.py
@@ -11,21 +11,21 @@ import re
 from telemetry.core import util
 from telemetry.page import buildbot_page_measurement_results
 from telemetry.page import cloud_storage
+from telemetry.page import page_measurement_value
 
 util.AddDirToPythonPath(util.GetChromiumSrcDir(), 'build', 'util')
 import lastchange  # pylint: disable=F0401
 
-
 _TEMPLATE_HTML_PATH = os.path.join(
     util.GetTelemetryDir(), 'support', 'html_output', 'results-template.html')
 _PLUGINS = [('third_party', 'flot', 'jquery.flot.min.js'),
+            ('third_party', 'flot', 'jquery.flot.errorbars.min.js'),
             ('third_party', 'WebKit', 'PerformanceTests', 'resources',
              'jquery.tablesorter.min.js'),
             ('third_party', 'WebKit', 'PerformanceTests', 'resources',
              'statistics.js')]
 _UNIT_JSON = ('tools', 'perf', 'unit-info.json')
 
-
 class HtmlPageMeasurementResults(
     buildbot_page_measurement_results.BuildbotPageMeasurementResults):
   def __init__(self, output_stream, test_name, reset_results, upload_results,
@@ -86,9 +86,7 @@ class HtmlPageMeasurementResults(
     super(HtmlPageMeasurementResults, self)._PrintPerfResult(
         measurement, trace, values, units, result_type)
 
-    metric_name = measurement
-    if trace != measurement:
-      metric_name += '.' + trace
+    metric_name = page_measurement_value.MeasurementName(measurement, trace)
     self._result_json['tests'].setdefault(self._test_name, {})
     self._result_json['tests'][self._test_name].setdefault('metrics', {})
     self._result_json['tests'][self._test_name]['metrics'][metric_name] = {
@@ -100,6 +98,16 @@ class HtmlPageMeasurementResults(
   def PrintSummary(self):
     super(HtmlPageMeasurementResults, self).PrintSummary()
 
+    for k in self._comparison_stats.keys():
+      self._result_json['tests'].setdefault(self._test_name, {})
+      self._result_json['tests'][self._test_name].setdefault('metrics', {})
+      self._result_json['tests'][self._test_name]['metrics'][k] = {
+        'reference_statistic': self._comparison_stats[k]['reference'],
+        'comparison_statistic': self._comparison_stats[k]['comparison'],
+        'units' : 'fraction',
+        'important' : False,
+      }
+
     json_results = self._GetResultsJson()
     json_results.append(self._result_json)
     html = self._GetHtmlTemplate()