Reland of [Telemetry] Migrate browser_test_runner to use typ as the test runner

telemetry/examples/browser_tests/process_tests.py

+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import sys
+
+from telemetry.testing import serially_executed_browser_test_case
+
+
+class FailIfSetUpProcessCalledTwice(
+    serially_executed_browser_test_case.SeriallyExecutedBrowserTestCase):
+  count = 0
+
+  @classmethod
+  def SetUpProcess(cls):
+    cls.count += 1
+    if cls.count >= 2:
+      assert False, 'This should not be called more than once'
+
+  @classmethod
+  def GenerateTestCases_DummyTest(cls, options):
+    del options  # Unused.
+    for i in xrange(0, 3):
+      yield 'Dummy_%i' % i, ()
+
+  def DummyTest(self):
+    pass
+
+
+class FailIfTearDownProcessCalledTwice(
+    serially_executed_browser_test_case.SeriallyExecutedBrowserTestCase):
+  count = 0
+
+  @classmethod
+  def TearDownProcess(cls):
+    cls.count += 1
+    if cls.count >= 2:
+      assert False, 'This should not be called more than once'
+
+  @classmethod
+  def GenerateTestCases_DummyTest(cls, options):
+    del options  # Unused.
+    for i in xrange(0, 3):
+      yield 'Dummy_%i' % i, ()
+
+  def DummyTest(self):
+    pass
+
+
+def load_tests(loader, tests, pattern):
+  del loader, tests, pattern  # Unused.
+  return serially_executed_browser_test_case.LoadAllTestsInModule(
+      sys.modules[__name__])