Revert of telemetry: Remove command line args from page test

tools/telemetry/telemetry/page/page_test_unittest.py

Index: tools/telemetry/telemetry/page/page_test_unittest.py
diff --git a/tools/telemetry/telemetry/page/page_test_unittest.py b/tools/telemetry/telemetry/page/page_test_unittest.py
index 665754886aea7f1e1eb87b05b404079cf043359a..2589b6fc9cecb152bcb1b872b20f372aaf3fe73c 100644
--- a/tools/telemetry/telemetry/page/page_test_unittest.py
+++ b/tools/telemetry/telemetry/page/page_test_unittest.py
@@ -20,6 +20,19 @@
 class PageTestThatFails(page_test.PageTest):
   def ValidateAndMeasurePage(self, page, tab, results):
     raise exceptions.IntentionalException
+
+
+class PageTestThatHasDefaults(page_test.PageTest):
+  def AddCommandLineArgs(self, parser):
+    parser.add_option('-x', dest='x', default=3)
+
+  def ValidateAndMeasurePage(self, page, tab, results):
+    if not hasattr(self.options, 'x'):
+      raise page_test.MeasurementFailure('Default option was not set.')
+    if self.options.x != 3:
+      raise page_test.MeasurementFailure(
+          'Expected x == 3, got x == ' + self.options.x)
+    results.AddValue(scalar.ScalarValue(page, 'x', 'ms', 7))
 
 
 class PageTestForBlank(page_test.PageTest):
@@ -88,6 +101,14 @@
     all_results = self.RunMeasurement(measurement, ps, options=self._options)
     self.assertEquals(1, len(all_results.failures))
 
+  def testDefaults(self):
+    ps = self.CreatePageSetFromFileInUnittestDataDir('blank.html')
+    measurement = PageTestThatHasDefaults()
+    all_results = self.RunMeasurement(measurement, ps, options=self._options)
+    self.assertEquals(len(all_results.all_page_specific_values), 1)
+    self.assertEquals(
+      all_results.all_page_specific_values[0].value, 7)
+
   # This test is disabled because it runs against live sites, and needs to be
   # fixed. crbug.com/179038
   @benchmark.Disabled