[Telemetry] Reuse shared state between story runs

telemetry/telemetry/page/page_run_end_to_end_unittest.py

Index: telemetry/telemetry/page/page_run_end_to_end_unittest.py
diff --git a/telemetry/telemetry/page/page_run_end_to_end_unittest.py b/telemetry/telemetry/page/page_run_end_to_end_unittest.py
index 6f041398f69344708999bf5448114474e3eb86a8..58ab543faaf99c706df514cbc3ada6ed13815240 100644
--- a/telemetry/telemetry/page/page_run_end_to_end_unittest.py
+++ b/telemetry/telemetry/page/page_run_end_to_end_unittest.py
@@ -171,8 +171,7 @@ class ActualPageRunEndToEndTests(unittest.TestCase):
     SetUpStoryRunnerArguments(options)
     results = results_options.CreateResults(EmptyMetadataForTest(), options)
     story_runner.Run(
-        test, story_set, options, results, tear_down_after_story=True,
-        metadata=EmptyMetadataForTest())
+        test, story_set, options, results, metadata=EmptyMetadataForTest())
     self.assertEquals(2, len(GetSuccessfulPageRuns(results)))
     self.assertEquals(2, test.browser_starts)
     self.assertFormattedExceptionIsEmpty()
@@ -378,8 +377,9 @@ class ActualPageRunEndToEndTests(unittest.TestCase):
     class TestSharedState(shared_page_state.SharedPageState):
 
       def _StopBrowser(self):
+        if self._browser:
+          num_times_browser_closed[0] += 1
         super(TestSharedState, self)._StopBrowser()
-        num_times_browser_closed[0] += 1
 
     story_set = story.StorySet()
     page = page_module.Page(