Update page cycler to differenciate between cold and warm run by default.

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 89d0a5704cceb37892767ad4943be20bcea39b31..ea84745823c4892ce6ccb0aecc8950323e37056b 100644
--- a/tools/perf/measurements/page_cycler_unittest.py
+++ b/tools/perf/measurements/page_cycler_unittest.py
@@ -49,21 +49,18 @@ class PageCyclerUnitTest(unittest.TestCase):
   def testOptionsColdLoadNoArgs(self):

[tonyg, 2013/11/06 18:31:49]

I find the code a little hard to follow. Could we add a test that confirms the
following (just to make sure my understanding is correct):

- PageSet with 2 URLs
- colod_load_percent is not passed in
- pageset_repeat is 3
- Verify that the first load of both URLs is reported as cold and the subsequent
2 loads of both URLs are reported as warm.

     cycler = self.setupCycler([])
 
-    self.assertFalse(cycler._cold_runs_requested)
-    self.assertEqual(cycler._number_warm_runs, 9)
+    self.assertEquals(cycler._cold_run_start_index, 10)
 
   def testOptionsColdLoadPagesetRepeat(self):
     cycler = self.setupCycler(['--pageset-repeat=20', '--page-repeat=2'])
 
-    self.assertFalse(cycler._cold_runs_requested)
-    self.assertEqual(cycler._number_warm_runs, 38)
+    self.assertEquals(cycler._cold_run_start_index, 40)
 
   def testOptionsColdLoadRequested(self):
     cycler = self.setupCycler(['--pageset-repeat=21', '--page-repeat=2',
                                '--cold-load-percent=40'])
 
-    self.assertTrue(cycler._cold_runs_requested)
-    self.assertEqual(cycler._number_warm_runs, 24)
+    self.assertEquals(cycler._cold_run_start_index, 26)
 
   def testIncompatibleOptions(self):
     exception_seen = False
@@ -131,5 +128,5 @@ class PageCyclerUnitTest(unittest.TestCase):
       self.assertEqual(result.values[0].trace_name, 'page_load_time')
       self.assertEqual(result.values[0].units, 'ms')
       self.assertEqual(result.values[0].chart_name,
-                       'warm_times' if i < 3 else 'cold_times')
+                       'warm_times' if i > 0 and i < 3 else 'cold_times')
       cycler.DidNavigateToPage(page, tab)