Host side implementation of ARC tts.

components/arc/tts/arc_tts_service.h

Index: components/arc/tts/arc_tts_service.h
diff --git a/components/arc/tts/arc_tts_service.h b/components/arc/tts/arc_tts_service.h
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+++ b/components/arc/tts/arc_tts_service.h
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+// 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_ARC_TTS_ARC_TTS_SERVICE_H_
+#define COMPONENTS_ARC_TTS_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,
+                      public InstanceHolder<mojom::TtsInstance>::Observer,
+                      public mojom::TtsHost {
+ public:
+  explicit ArcTtsService(ArcBridgeService* bridge_service);
+  ~ArcTtsService() override;
+
+  // InstanceHolder<mojom::TtsInstance>::Observer overrides:
+  void OnInstanceReady() override;
+
+  // TtsHost overrides:
+  void OnTtsEvent(uint32_t utterance_id,
+                  mojom::TtsEventType event_type) override;
+
+ private:
+  mojo::Binding<mojom::TtsHost> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcTtsService);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_TTS_ARC_TTS_SERVICE_H_