Add try server configuration for 'git cl try'.

BUG=
R=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/177533029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19641 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

PRESUBMIT.py

@@ -98,3 +98,12 @@ def CheckChangeOnCommit(input_api, output_api):
         input_api, output_api,
         json_url='http://v8-status.appspot.com/current?format=json'))
   return results
+
+
+def GetPreferredTryMasters(project, change):
+  return {
+    'tryserver.v8': {
+      'v8_mac_rel': set(['defaulttests']),
+      'v8_win_rel': set(['defaulttests']),
+    },
+  }