Move serving_dirs to UserStorySet, update user_story_runner.

tools/telemetry/telemetry/page/page_unittest.py

Index: tools/telemetry/telemetry/page/page_unittest.py
diff --git a/tools/telemetry/telemetry/page/page_unittest.py b/tools/telemetry/telemetry/page/page_unittest.py
index b392e55b457d90a402787dc4cfa3ef992fe6af59..308046f5b63c262f3289b7154e6d4d48d593442a 100644
--- a/tools/telemetry/telemetry/page/page_unittest.py
+++ b/tools/telemetry/telemetry/page/page_unittest.py
@@ -153,3 +153,16 @@ class TestPage(unittest.TestCase):
     self.assertEqual([page_foo, page_baz], page_set_a.pages)
     self.assertEqual([page_bar], page_set_b.pages)
     self.assertIs(page_set_b, page_bar.page_set)
+
+  def testIsLocal(self):
+    p = page.Page('file://foo.html')
+    self.assertTrue(p.is_local)
+
+    p = page.Page('chrome://extensions')
+    self.assertTrue(p.is_local)
+
+    p = page.Page('about:blank')
+    self.assertTrue(p.is_local)
+
+    p = page.Page('http://foo.com')
+    self.assertFalse(p.is_local)