[USS] Show USS counters in Types tab

components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.h

Index: components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.h
diff --git a/components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.h b/components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.h
new file mode 100644
index 0000000000000000000000000000000000000000..d15bd6c0421a4d14637f5a4bde5269cbdcde4d84
--- /dev/null
+++ b/components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.h
@@ -0,0 +1,30 @@
+// 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.
+
+#ifndef COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_NON_BLOCKING_TYPE_DEBUG_INFO_EMITTER_H_
+#define COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_NON_BLOCKING_TYPE_DEBUG_INFO_EMITTER_H_
+
+#include "base/macros.h"
+#include "components/sync/engine_impl/cycle/data_type_debug_info_emitter.h"
+
+namespace syncer {
+
+class NonBlockingTypeDebugInfoEmitter : public DataTypeDebugInfoEmitter {
+ public:
+  NonBlockingTypeDebugInfoEmitter(
+      ModelType type,
+      base::ObserverList<TypeDebugInfoObserver>* observers);
+
+  ~NonBlockingTypeDebugInfoEmitter() override;
+
+  // Triggers a status counters update to registered observers.
+  void EmitStatusCountersUpdate() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NonBlockingTypeDebugInfoEmitter);
+};
+
+}  // namespace syncer
+
+#endif  // COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_NON_BLOCKING_TYPE_DEBUG_INFO_EMITTER_H_