Merge all logic in PageMeasurementResults to PageTestResults.

tools/perf/metrics/test_page_measurement_results.py

Index: tools/perf/metrics/test_page_measurement_results.py
diff --git a/tools/perf/metrics/test_page_measurement_results.py b/tools/perf/metrics/test_page_measurement_results.py
index 6668e83726b3a1d08f610284bc115cc2b05f8bdf..8d17e5b575771b8f6b1f404144869e582a967f2f 100644
--- a/tools/perf/metrics/test_page_measurement_results.py
+++ b/tools/perf/metrics/test_page_measurement_results.py
@@ -13,7 +13,7 @@ class TestPageMeasurementResults(
     super(TestPageMeasurementResults, self).__init__()
     self.test = test
     page = page_module.Page("http://www.google.com", {})
-    self.WillMeasurePage(page)
+    self.StartTest(page)
 
   def GetPageSpecificValueNamed(self, name):
     values = [value for value in self.all_page_specific_values