Host side implementation of ARC tts.

components/arc/common/tts.mojom

Index: components/arc/common/tts.mojom
diff --git a/components/arc/common/tts.mojom b/components/arc/common/tts.mojom
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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.

[Luis Héctor Chávez, 2016/07/26 22:48:11]

// Next MinVersion=1

[David Tseng, 2016/07/27 22:50:59]

Done.

+
+module arc.mojom;
+
+enum TtsEventType {

[Luis Héctor Chávez, 2016/07/26 22:48:11]

Can this change in the future? If so, please add an [Extensible] tag.

[David Tseng, 2016/07/27 22:50:59]

Done.

+  START = 0,
+  END,
+  INTERRUPTED,
+  ERROR
+};
+
+// Represents a tts utterance sent from Chrome to Android.
+struct TtsUtterance {
+  uint32 utteranceId;
+  string text;
+  double rate;
+  double pitch;
+};
+
+interface TtsHost {

[Luis Héctor Chávez, 2016/07/26 22:48:11]

// Next Method ID: 1

[David Tseng, 2016/07/27 22:50:59]

Done.

+  // Notifies Chrome of Android tts events.
+  OnTtsEvent(uint32 utteranceId, TtsEventType event_type);

[hidehiko, 2016/07/26 17:59:18]

Could you add @ index? Ditto for TtsInstance's methods below.

[David Tseng, 2016/07/27 22:50:59]

Done.

+};
+
+interface TtsInstance {

[Luis Héctor Chávez, 2016/07/26 22:48:11]

// Next Method ID: 3

[David Tseng, 2016/07/27 22:50:59]

Done.

+  // Establishes full-duplex communication with the host.
+  Init(TtsHost host_ptr);
+
+  // Sends an utterance to Android for synthesis.
+  Speak(TtsUtterance utterance);
+
+  // Sends a stop request to Android text to speech.
+  Stop();
+};