[USS] Show USS counters in about:sync page

components/sync/engine_impl/cycle/directory_type_debug_info_emitter.cc

Index: components/sync/engine_impl/cycle/directory_type_debug_info_emitter.cc
diff --git a/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.cc b/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.cc
index d7b9b1a3064c609aed44e7181497de268c06dd3b..7b0cb5dc008fdaa6645af24e688aecb369771143 100644
--- a/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.cc
+++ b/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.cc
@@ -8,6 +8,7 @@
 
 #include <vector>
 
+#include "base/memory/ptr_util.h"
 #include "components/sync/engine/cycle/status_counters.h"
 #include "components/sync/engine/cycle/type_debug_info_observer.h"
 #include "components/sync/syncable/entry.h"
@@ -72,19 +73,19 @@ void DirectoryTypeDebugInfoEmitter::EmitStatusCountersUpdate() {
   std::vector<int64_t> result;
   directory_->GetMetaHandlesOfType(&trans, type_, &result);
 
-  StatusCounters counters;
-  counters.num_entries_and_tombstones = result.size();
+  std::unique_ptr<StatusCounters> counters = base::MakeUnique<StatusCounters>();
+  counters->num_entries_and_tombstones = result.size();
 
   for (std::vector<int64_t>::const_iterator it = result.begin();
        it != result.end(); ++it) {
     syncable::Entry e(&trans, syncable::GET_BY_HANDLE, *it);
     if (!e.GetIsDel()) {
-      counters.num_entries++;
+      counters->num_entries++;
     }
   }
 
   FOR_EACH_OBSERVER(TypeDebugInfoObserver, (*type_debug_info_observers_),
-                    OnStatusCountersUpdated(type_, counters));
+                    OnStatusCountersUpdated(type_, std::move(counters)));

[pavely, 2016/09/30 00:01:51]

Same argument as in ProfileSyncService. Who will get ownership of counters when
there is more than one observer?

[Gang Wu, 2016/10/01 07:14:09]

Done.

 }
 
 }  // namespace syncer