Implement Google network speech synthesis

chrome/common/extensions/api/tts.json

 // Copyright (c) 2012 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.
 
 [
   {
     "namespace": "tts",
     "description": "Use the <code>chrome.tts</code> API to play synthesized text-to-speech (TTS). See also the related <a href='http://developer.chrome.com/extensions/ttsEngine.html'>ttsEngine</a> API, which allows an extension to implement a speech engine.",
     "types": [
       {
@@ skipping 44 matching lines @@
             "type": "string",
             "optional": true,
             "description": "The language that this voice supports, in the form <em>language</em>-<em>region</em>. Examples: 'en', 'en-US', 'en-GB', 'zh-CN'."
           },
           "gender": {
             "type": "string",
             "optional": true,
             "description": "This voice's gender.",
             "enum": ["male", "female"]
           },
+          "remote": {
+            "type": "boolean",
+            "optional": true,
+            "description": "If true, the synthesis engine is a remote network resource. It may be higher latency and may incur bandwidth costs."
+          },
           "extensionId": {
             "type": "string",
             "optional": true,
             "description": "The ID of the extension providing this voice."
           },
           "eventTypes": {
             "type": "array",
             "items": {"type": "string"},
             "optional": true,
             "description": "All of the callback event types that this voice is capable of sending."
@@ skipping 168 matching lines @@
             "name": "event",
             "$ref": "TtsEvent",
             "description": "The event from the text-to-speech engine indicating the status of this utterance."
           }
         ],
         "description": "Used to pass events back to the function calling speak()."
       }
     ]
   }
 ]