Host side implementation of ARC tts.

chrome/browser/chromeos/arc/arc_tts_service.h

+// 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 CHROME_BROWSER_CHROMEOS_ARC_ARC_TTS_SERVICE_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_ARC_TTS_SERVICE_H_
+
+#include "base/macros.h"
+#include "components/arc/arc_service.h"
+#include "components/arc/common/tts.mojom.h"
+#include "components/arc/instance_holder.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace arc {
+
+class ArcBridgeService;
+
+class ArcTtsService : public ArcService,

[hidehiko, 2016/08/02 03:56:20]

Could you add brief comment about what is the responsibility of this class?

[David Tseng, 2016/08/02 16:32:18]

Done.

+                      public InstanceHolder<mojom::TtsInstance>::Observer,
+                      public mojom::TtsHost {
+ public:
+  explicit ArcTtsService(ArcBridgeService* bridge_service);
+  ~ArcTtsService() override;
+
+  // InstanceHolder<mojom::TtsInstance>::Observer overrides:
+  void OnInstanceReady() override;
+
+  // mojom::TtsHost overrides:
+  void OnTtsEvent(uint32_t id,
+                  mojom::TtsEventType event_type,
+                  uint32_t char_index,
+                  const mojo::String& error_msg) override;
+
+ private:
+  mojo::Binding<mojom::TtsHost> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcTtsService);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_TTS_SERVICE_H_