Add support for patch_url field in BuildEvent

infra_libs/event_mon/test/monitoring_test.py

Index: infra_libs/event_mon/test/monitoring_test.py
diff --git a/infra_libs/event_mon/test/monitoring_test.py b/infra_libs/event_mon/test/monitoring_test.py
index 76fe8670fbef3102e1ceecce9d7cd50db33bc6ed..597bb8e543a865cee9b199e8f180b47a501f85fe 100644
--- a/infra_libs/event_mon/test/monitoring_test.py
+++ b/infra_libs/event_mon/test/monitoring_test.py
@@ -302,6 +302,17 @@ class GetBuildEventTest(unittest.TestCase):
     self.assertEquals(event.build_event.host_name, hostname)
     self.assertEquals(event.build_event.build_name, build_name)
 
+  def test_get_build_event_with_patch_url(self):
+    patch_url = 'http://foo.bar/123#456'
+    log_event = monitoring.get_build_event(
+        'BUILD', 'bot.host.name', 'build_name', patch_url=patch_url).log_event()
+    self.assertIsInstance(log_event, LogRequestLite.LogEventLite)
+
+    # Check that source_extension deserializes to the right thing.
+    event = ChromeInfraEvent.FromString(log_event.source_extension)
+    self.assertTrue(event.HasField('build_event'))
+    self.assertEquals(event.build_event.patch_url, patch_url)
+
   def test_get_build_event_invalid_type(self):
     # An invalid type is a critical error.
     log_event = monitoring.get_build_event('INVALID_TYPE',