Add sharding support to browser_test_runner.

telemetry/examples/browser_tests/simple_sharding_test.py

Index: telemetry/examples/browser_tests/simple_sharding_test.py
diff --git a/telemetry/examples/browser_tests/simple_sharding_test.py b/telemetry/examples/browser_tests/simple_sharding_test.py
new file mode 100644
index 0000000000000000000000000000000000000000..be56d6c9a77e695cfa2fe65bac9afc3bb52a0a48
--- /dev/null
+++ b/telemetry/examples/browser_tests/simple_sharding_test.py
@@ -0,0 +1,27 @@
+# Copyright 2016 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.
+
+from telemetry.testing import serially_executed_browser_test_case
+
+
+class SimpleShardingTest(
+    serially_executed_browser_test_case.SeriallyBrowserTestCase):
+
+  def Test1(self):
+    pass
+
+  def Test2(self):
+    pass
+
+  def Test3(self):
+    pass
+
+  @classmethod
+  def GenerateTestCases_PassingTest(cls, options):
+    del options  # unused
+    for i in xrange(10):
+      yield 'passing_test_' + str(i), (i,)
+
+  def PassingTest(self, a):
+    self.assertGreaterEqual(a, 0)