--- a/mercurial/revlog.py	Tue Mar 24 11:00:09 2015 -0700
+++ b/mercurial/revlog.py	Fri Mar 20 11:14:27 2015 -0700
@@ -724,6 +724,9 @@
         except AttributeError:
             return self._headrevs()
 
+    def computephases(self, roots):
+        return self.index.computephases(roots)
+
     def _headrevs(self):
         count = len(self)
         if not count: