Adds "tts" permission for Input Tools & XKB extension.

chrome/browser/resources/chromeos/input_method/google_input_tools_manifest.json

 {
   "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDyRb75ZzKuseD4ZEposVSGTJQjdySVjVA0s2hgFYDJ3hRh5wATyWsLL7EYvbfi2K+hbYBvrxOQYot4eArQloShy4tdQTZovmTXIINIOzN3j/avFfrYSnJNV6C6gpGKglGVEw/lhf+6WdSnGoWjqXWQnnJltc2JtiAk51nkFJUWZwIDAQAB",
   "name": "__MSG_chos_inputtool_title__",
   "version": "4.3.2.3",
   "description": "The Google Input Tools",
   "default_locale": "en",
   "incognito": "split",
   "permissions": [
     "accessibilityFeatures.read",
     "app.window.alpha",
     "app.window.alwaysOnTop",
     "app.window.ime",
     "audioCapture",
     "https://clients4.google.com/",
     "https://dl.google.com/",
     "https://www.googleapis.com/",
     "input",
     "inputMethodPrivate",
     "metricsPrivate",
     "tabs",
+    "tts",
     "unlimitedStorage",
     "virtualKeyboardPrivate"
   ],
   "background": {
     "page": "background.html"
   },
   "content_scripts": [
     {
       "matches": ["https://www.googleapis.com/auth/imesync*"],
       "js": ["chos_inject-debug.js"]
@@ skipping 581 matching lines @@
       "type": "ime",
       "id": "vkd_ru_phone_yazhert",
       "description": "",
       "language": ["ru"],
       "layouts": ["us"],
       "input_view": "inputview.html#id=m17n:ru_phone_yazhert&language=ru&passwordLayout=us-ltr&name=keyboard_russian_phonetic_yazhert"
     }
   ],
   "manifest_version": 2
 }