sync: Introduce classes for per-type counters

sync/internal_api/public/sessions/update_counters.cc

Index: sync/internal_api/public/sessions/update_counters.cc
diff --git a/sync/internal_api/public/sessions/update_counters.cc b/sync/internal_api/public/sessions/update_counters.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0656bafa1fae0abffae950069f2bb9946bc5a040
--- /dev/null
+++ b/sync/internal_api/public/sessions/update_counters.cc
@@ -0,0 +1,53 @@
+// Copyright 2014 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.
+
+#include "sync/internal_api/public/sessions/update_counters.h"
+
+#include "base/json/json_string_value_serializer.h"
+#include "base/values.h"
+
+namespace syncer {
+
+UpdateCounters::UpdateCounters()
+  : num_updates_received(0),
+    num_reflected_updates_received(0),
+    num_tombstone_updates_received(0),
+    num_updates_applied(0),
+    num_hierarchy_conflict_application_failures(0),
+    num_encryption_conflict_application_failures(0),
+    num_server_overwrites(0),
+    num_local_overwrites(0) {}
+
+UpdateCounters::~UpdateCounters() {}
+
+scoped_ptr<base::DictionaryValue> UpdateCounters::ToValue() const {
+  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
+
+  value->SetInteger("numUpdatesReceived", num_updates_received);
+  value->SetInteger("numReflectedUpdatesReceived",
+                    num_reflected_updates_received);
+  value->SetInteger("numTombstoneUpdatesReceived",
+                    num_tombstone_updates_received);
+
+  value->SetInteger("numUpdatesApplied", num_updates_applied);
+  value->SetInteger("numHierarchyConflictApplicationFailures",
+                    num_hierarchy_conflict_application_failures);
+  value->SetInteger("numEncryptionConflictApplicationFailures",
+                    num_encryption_conflict_application_failures);
+
+  value->SetInteger("numServerOverwrites", num_server_overwrites);
+  value->SetInteger("numLocalOverwrites", num_local_overwrites);
+
+  return value.Pass();
+}
+
+std::string UpdateCounters::ToString() const {
+  std::string result;
+  scoped_ptr<base::DictionaryValue> value = ToValue();
+  JSONStringValueSerializer serializer(&result);
+  serializer.Serialize(*value);
+  return result;
+}
+
+}  // namespace syncer