AU: Cut cycles even more aggressively, log progress of cutting

BUG=None
TEST=tested/applied delta on host

Review URL: http://codereview.chromium.org/3130035
diff --git a/cycle_breaker.h b/cycle_breaker.h
index 359f55b..9c10c17 100644
--- a/cycle_breaker.h
+++ b/cycle_breaker.h
@@ -34,7 +34,7 @@
  private:
   void HandleCircuit();
   void Unblock(Vertex::Index u);
-  bool Circuit(Vertex::Index vertex);
+  bool Circuit(Vertex::Index vertex, Vertex::Index depth);
   bool StackContainsCutEdge() const;
 
   std::vector<bool> blocked_;  // "blocked" in the paper