[USS] Show USS counters in about:sync page

components/sync/engine_impl/syncer_unittest.cc

Index: components/sync/engine_impl/syncer_unittest.cc
diff --git a/components/sync/engine_impl/syncer_unittest.cc b/components/sync/engine_impl/syncer_unittest.cc
index 05638f5f72d84eeec120c392003a0c829308a8cc..cac588f6dcdc0c8c0de08c1919b56fdfcff4bf83 100644
--- a/components/sync/engine_impl/syncer_unittest.cc
+++ b/components/sync/engine_impl/syncer_unittest.cc
@@ -113,8 +113,9 @@ class TypeDebugInfoCache : public TypeDebugInfoObserver {
                                const CommitCounters& counters) override;
   void OnUpdateCountersUpdated(syncer::ModelType type,
                                const UpdateCounters& counters) override;
-  void OnStatusCountersUpdated(syncer::ModelType type,
-                               const StatusCounters& counters) override;
+  void OnStatusCountersUpdated(
+      syncer::ModelType type,
+      std::unique_ptr<StatusCounters> counters) override;
 
  private:
   std::map<ModelType, CommitCounters> commit_counters_map_;
@@ -173,8 +174,8 @@ void TypeDebugInfoCache::OnUpdateCountersUpdated(
 
 void TypeDebugInfoCache::OnStatusCountersUpdated(
     syncer::ModelType type,
-    const StatusCounters& counters) {
-  status_counters_map_[type] = counters;
+    std::unique_ptr<StatusCounters> counters) {
+  status_counters_map_[type] = *counters;
 }
 
 }  // namespace