[pinpoint] Gerrit patch support.

dashboard/dashboard/pinpoint/models/quest/find_isolate.py

Index: dashboard/dashboard/pinpoint/models/quest/find_isolate.py
diff --git a/dashboard/dashboard/pinpoint/models/quest/find_isolate.py b/dashboard/dashboard/pinpoint/models/quest/find_isolate.py
index 295a0d7ef8dc725e54f7f58a79a4f44354ddb31c..8f1d983a5e31464dbc55aedf32711c20efb5d160 100644
--- a/dashboard/dashboard/pinpoint/models/quest/find_isolate.py
+++ b/dashboard/dashboard/pinpoint/models/quest/find_isolate.py
@@ -151,14 +151,7 @@ def _RequestBuild(builder_name, change):
   }
 
   if change.patch:
-    # TODO: Support Gerrit.
-    # https://github.com/catapult-project/catapult/issues/3599
-    parameters['properties'].update({
-        'patch_storage': 'rietveld',
-        'rietveld': change.patch.server,
-        'issue': change.patch.issue,
-        'patchset': change.patch.patchset,
-    })
+    parameters['properties'].update(change.patch.BuildParameters())
 
   # TODO: Look up Buildbucket bucket from builder_name.
   return buildbucket_service.Put(BUCKET, parameters)