Add routing info and unrecoverable error info to about:sync

chrome/browser/sync/engine/model_safe_worker.h

Index: chrome/browser/sync/engine/model_safe_worker.h
===================================================================
--- chrome/browser/sync/engine/model_safe_worker.h	(revision 49216)
+++ chrome/browser/sync/engine/model_safe_worker.h	(working copy)
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_SYNC_ENGINE_MODEL_SAFE_WORKER_H_
 
 #include <map>
+#include <string>
 #include <vector>
 
 #include "base/ref_counted.h"
@@ -29,6 +30,8 @@
   MODEL_SAFE_GROUP_COUNT,
 };
 
+std::string ModelSafeGroupToString(ModelSafeGroup group);
+
 // The Syncer uses a ModelSafeWorker for all tasks that could potentially
 // modify syncable entries (e.g under a WriteTransaction). The ModelSafeWorker
 // only knows how to do one thing, and that is take some work (in a fully
@@ -63,7 +66,7 @@
 
  private:
   friend class base::RefCountedThreadSafe<ModelSafeWorker>;
- 
+
   DISALLOW_COPY_AND_ASSIGN(ModelSafeWorker);
 };