mojo: Add a runloop utility in python

mojo/python/tests/runloop_unittest.py

Index: mojo/python/tests/runloop_unittest.py
diff --git a/mojo/python/tests/runloop_unittest.py b/mojo/python/tests/runloop_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..1195c1b91706c926d41519ccf463ac00bad4c481
--- /dev/null
+++ b/mojo/python/tests/runloop_unittest.py
@@ -0,0 +1,24 @@
+# Copyright 2014 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 unittest
+
+# pylint: disable=F0401
+import mojo.embedder
+from mojo import system
+
+class RunLoopTest(unittest.TestCase):
+
+  def setUp(self):
+    mojo.embedder.Init()
+
+  def testRunLoop(self):
+    loop = system.RunLoop()
+    array = []
+    def Increment():
+      array.append(0)
+    for _ in xrange(10):
+      loop.PostDelayedTask(Increment)
+    loop.RunUntilIdle()
+    self.assertEquals(len(array), 10)