[PCv1] Avoid using dot in metrics name

tools/perf/measurements/page_cycler_unittest.py

Index: tools/perf/measurements/page_cycler_unittest.py
diff --git a/tools/perf/measurements/page_cycler_unittest.py b/tools/perf/measurements/page_cycler_unittest.py
index 5fa0deed3ec33d98f65ed13f29f7c1f63e164f57..ecc0c2459331a5947efb561b1a9b44f441a1425b 100644
--- a/tools/perf/measurements/page_cycler_unittest.py
+++ b/tools/perf/measurements/page_cycler_unittest.py
@@ -210,7 +210,7 @@ class PageCyclerUnitTest(unittest.TestCase):
 
       self.assertEqual(values[0].page, page)
       chart_name = 'cold_times' if i == 0 or i > 2 else 'warm_times'
-      self.assertEqual(values[0].name, '%s.page_load_time' % chart_name)
+      self.assertEqual(values[0].name, '%s-page_load_time' % chart_name)
       self.assertEqual(values[0].units, 'ms')
 
       cycler.DidNavigateToPage(page, tab)
@@ -233,7 +233,7 @@ class PageCyclerUnitTest(unittest.TestCase):
         self.assertEqual(values[0].page, page)
 
         chart_name = 'cold_times' if i == 0 or i > 1 else 'warm_times'
-        self.assertEqual(values[0].name, '%s.page_load_time' % chart_name)
+        self.assertEqual(values[0].name, '%s-page_load_time' % chart_name)
         self.assertEqual(values[0].units, 'ms')
 
         cycler.DidNavigateToPage(page, tab)
@@ -256,20 +256,20 @@ class PageCyclerUnitTest(unittest.TestCase):
 
         # On Mac, there is an additional measurement: the number of keychain
         # accesses.
-        value_count = 4
+        value_count = 6
         if sys.platform == 'darwin':
           value_count += 1
         self.assertEqual(value_count, len(values))
 
         self.assertEqual(values[0].page, page)
         chart_name = 'cold_times' if i == 0 else 'warm_times'
-        self.assertEqual(values[0].name, '%s.page_load_time' % chart_name)
+        self.assertEqual(values[0].name, '%s-page_load_time' % chart_name)
         self.assertEqual(values[0].units, 'ms')
-        self.assertEqual(values[1].name, '%s.time_to_onload' % chart_name)
+        self.assertEqual(values[1].name, '%s-time_to_onload' % chart_name)
         self.assertEqual(values[1].units, 'ms')
 
         expected_values = ['gpu', 'browser']
-        for value, expected in zip(values[2:len(expected_values) + 1],
+        for value, expected in zip(values[4:len(expected_values) + 1],
                                    expected_values):
           self.assertEqual(value.page, page)
           self.assertEqual(value.name,