[USS] Show USS counters in Types tab

components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.cc

Index: components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.cc
diff --git a/components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.cc b/components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..367478446290dffe4e7dfb6fcfe0086b228320c3
--- /dev/null
+++ b/components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.cc
@@ -0,0 +1,32 @@
+// Copyright 2016 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 "components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.h"
+
+#include <vector>
+
+#include "components/sync/engine/cycle/status_counters.h"
+#include "components/sync/engine/cycle/type_debug_info_observer.h"
+
+namespace syncer {
+
+NonBlockingTypeDebugInfoEmitter::NonBlockingTypeDebugInfoEmitter(
+    ModelType type,
+    base::ObserverList<TypeDebugInfoObserver>* observers)
+    : DataTypeDebugInfoEmitter(type, observers) {}
+
+NonBlockingTypeDebugInfoEmitter::~NonBlockingTypeDebugInfoEmitter() {}
+
+void NonBlockingTypeDebugInfoEmitter::EmitStatusCountersUpdate() {
+  // TODO(gangwu): this function is to show Total Entries on "Types" tab on
+  // chrome://sync-internals, we decide to show zero right now, because it is
+  // hard to let emitter to get object of SharedModelTypeProcessor or
+  // ModelTypeStore, and also people can get the numbers from "about" tab on
+  // chrome://sync-internals.
+  StatusCounters counters;
+  for (auto& observer : *type_debug_info_observers_)
+    observer.OnStatusCountersUpdated(type_, counters);
+}
+
+}  // namespace syncer