Implement Google network speech synthesis

chrome/common/extensions/api/system_private.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": "systemPrivate",
     "description": "none",
     "types": [
       {
@@ skipping 68 matching lines @@
             "name": "callback",
             "parameters": [
               {
                 "$ref": "UpdateStatus",
                 "name": "status",
                 "description": "Details of the system update"
               }
             ]
           }
         ]
+      },
+      {
+        "name": "getApiKey",
+        "type": "function",
+        "description": "Gets Chrome's API key to use for requests to Google services.",
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "parameters": [
+              {
+                "name": "key",
+                "type": "string",
+                "description": "The API key."
+              }
+            ]
+          }
+        ]
       }
     ],
     "events": [
       {
         "name": "onVolumeChanged",
         "type": "function",
         "description": "Fired when the volume is changed.",
         "parameters": [
           {
             "$ref": "VolumeInfo",
@@ skipping 22 matching lines @@
       },
       {
         "name": "onWokeUp",
         "type": "function",
         "description": "Fired when the device wakes up from sleep.",
         "parameters": []
       }
     ]
   }
 ]