Automatically trigger installation of high-quality speech synthesis extension.

chrome/browser/resources/chromeos/speech_synthesis/manifest.json

 {
-  "name": "Chrome OS built-in text-to-speech extension",
-  "version": "0.0.2",
-  "description": "Text-to-speech (TTS) voice extension using Native Client technology.",
+  "name": "Chrome OS text-to-speech component extension",
+  "version": "1.0.2",
+  "description": "Chrome OS native text-to-speech implemented using native client.",
   "manifest_version": 2,
   "background": {
     "scripts": [
       "voice_data_hmm_de-DE.js",
       "voice_data_hmm_en-GB.js",
       "voice_data_hmm_en-US.js",
       "voice_data_hmm_es-ES.js",
       "voice_data_hmm_fr-FR.js",
       "voice_data_hmm_it-IT.js",
       "tts_controller.js",
       "tts_main.js"
-    ]
+    ],
+    "persistent": false
   },
   "permissions": [
     "ttsEngine",
     "unlimitedStorage"
   ],
   "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDlKEJseIIbKFyX0BCWNYOWlPEUt1IxBvIoW1PI7DTmipbwyVr3s2EprewYdtr9hCO5Yzs5w/ai1Xnhet5PLAsMje6ZP0Kvq0tlVfaYF8oQHBPF+ifx31RBT7Cn+ZVKLq1fxrwzY063GVhW+CAr06Ar8YRFXtFoC4FHlUNDIoSb4wIDAQAB",
   "tts_engine": {
     "voices": [
       {
         "voice_name": "Chrome OS French",
         "lang": "fr-FR",
         "gender": "female",
         "event_types": [ "start", "word", "end", "error" ]
       },
       {
         "voice_name": "Chrome OS German",
         "lang": "de-DE",
         "gender": "female",
         "event_types": [ "start", "word", "end", "error" ]
       },
       {
         "voice_name": "Chrome OS Italian",
         "lang": "it-IT",
         "gender": "female",
         "event_types": [ "start", "word", "end", "error" ]
       },
       {
-        "voice_name": "Chrome OS US English",
+        "voice_name": "Chrome OS US English Female",
         "lang": "en-US",
         "gender": "female",
         "event_types": [ "start", "word", "end", "error" ]
       },
       {
-        "voice_name": "Chrome OS British English",
+        "voice_name": "Chrome OS British English Female",
         "lang": "en-GB",
         "gender": "female",
         "event_types": [ "start", "word", "end", "error" ]
       },
       {
         "voice_name": "Chrome OS Spanish",
         "lang": "es-ES",
         "gender": "female",
         "event_types": [ "start", "word", "end", "error" ]
       }
     ]
   }
 }