[USS] Show USS counters in about:sync page

components/sync/engine_impl/syncer_unittest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Syncer unit tests. Unfortunately a lot of these tests
 // are outdated and need to be reworked and updated.
 
 #include "components/sync/engine_impl/syncer.h"
 
 #include <stddef.h>
@@ skipping 95 matching lines @@
 
   CommitCounters GetLatestCommitCounters(ModelType type) const;
   UpdateCounters GetLatestUpdateCounters(ModelType type) const;
   StatusCounters GetLatestStatusCounters(ModelType type) const;
 
   // TypeDebugInfoObserver implementation.
   void OnCommitCountersUpdated(syncer::ModelType type,
                                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_;
   std::map<ModelType, UpdateCounters> update_counters_map_;
   std::map<ModelType, StatusCounters> status_counters_map_;
 };
 
 TypeDebugInfoCache::TypeDebugInfoCache() {}
 
 TypeDebugInfoCache::~TypeDebugInfoCache() {}
@@ skipping 38 matching lines @@
 }
 
 void TypeDebugInfoCache::OnUpdateCountersUpdated(
     syncer::ModelType type,
     const UpdateCounters& counters) {
   update_counters_map_[type] = counters;
 }
 
 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
 
 class SyncerTest : public testing::Test,
                    public SyncCycle::Delegate,
                    public SyncEngineEventListener {
  protected:
   SyncerTest()
       : extensions_activity_(new ExtensionsActivity),
@@ skipping 5657 matching lines @@
     EXPECT_EQ("xyz", final_monitor_records["xyz"].extension_id);
     EXPECT_EQ(2049U, final_monitor_records["ABC"].bookmark_write_count);
     EXPECT_EQ(4U, final_monitor_records["xyz"].bookmark_write_count);
   } else {
     EXPECT_TRUE(final_monitor_records.empty())
         << "Should not restore records after successful bookmark commit.";
   }
 }
 
 }  // namespace syncer