mac: Expose keychain access frequency to Telemetry.

tools/perf/measurements/memory_multi_tab.py

Index: tools/perf/measurements/memory_multi_tab.py
diff --git a/tools/perf/measurements/memory_multi_tab.py b/tools/perf/measurements/memory_multi_tab.py
index e6891512d5beb1244fa2c83f416bae999314560d..32b7d41ddeb59c71e6cd89bd9b5e45b4cac386c8 100644
--- a/tools/perf/measurements/memory_multi_tab.py
+++ b/tools/perf/measurements/memory_multi_tab.py
@@ -8,11 +8,10 @@ This test is a multi tab test, but we're interested in measurements for
 the entire test rather than each single page.
 """
 
-
+from measurements import PageTestMeasurement
 from metrics import memory
-from telemetry.page import page_test
 
-class MemoryMultiTab(page_test.PageTest):
+class MemoryMultiTab(PageTestMeasurement):
   def __init__(self, *args, **kwargs):
     super(MemoryMultiTab, self).__init__(*args, **kwargs)
     self._memory_metric = None
@@ -23,6 +22,7 @@ class MemoryMultiTab(page_test.PageTest):
     self._memory_metric = memory.MemoryMetric(browser)
 
   def CustomizeBrowserOptions(self, options):
+    super(MemoryMultiTab, self).CustomizeBrowserOptions(options)
     memory.MemoryMetric.CustomizeBrowserOptions(options)
     # Since this is a memory benchmark, we want to sample memory histograms at
     # a high frequency.
@@ -38,6 +38,8 @@ class MemoryMultiTab(page_test.PageTest):
       self._first_tab = tab
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    super(MemoryMultiTab, self).ValidateAndMeasurePage(page, tab, results)
+
     # Finalize measurement on the last tab.
     if len(tab.browser.tabs) == len(page.page_set.pages):
       self._memory_metric.Stop(page, self._first_tab)