Collect tab timing information for use in telementry-based startup tests

tools/perf/perf_tools/startup_measurement.py

Index: tools/perf/perf_tools/startup_measurement.py
diff --git a/tools/perf/perf_tools/startup_measurement.py b/tools/perf/perf_tools/startup_measurement.py
index 0c4284ffbc2acd54d8a9027209d2561929b6af88..f1150904f459e228c10c2a7951ef5f77afa8236b 100644
--- a/tools/perf/perf_tools/startup_measurement.py
+++ b/tools/perf/perf_tools/startup_measurement.py
@@ -19,11 +19,23 @@ class PerfWarm(page_measurement.PageMeasurement):
                                    discard_first_result=True)
 
   def CustomizeBrowserOptions(self, options):
+    options.AppendExtraBrowserArg('--enable-stats-collection-bindings')
+    options.AppendExtraBrowserArg(
+          '--reduce-security-for-stats-collection-tests')
+
+    # Old commandline flags used for reference builds.
     options.AppendExtraBrowserArg('--dom-automation')
-    options.AppendExtraBrowserArg('--reduce-security-for-dom-automation-tests')
+    options.AppendExtraBrowserArg(
+          '--reduce-security-for-dom-automation-tests')
 
   def MeasurePage(self, page, tab, results):
-    get_histogram_js = "domAutomationController.getBrowserHistogram(\"%s\")"
+    # TODO(jeremy): Remove references to
+    # domAutomationController.getBrowserHistogram when we update the reference
+    # builds.
+    get_histogram_js = ('(window.statsCollectionController ?'
+        'statsCollectionController :'
+        'domAutomationController).getBrowserHistogram("%s")')
+
 
     for display_name, histogram_name in self.HISTOGRAMS_TO_RECORD.iteritems():
       result = tab.EvaluateJavaScript(get_histogram_js % histogram_name)