Hangout remote desktop part II - background.html and AppLauncher

remoting/webapp/manifest.json.jinja2

 {
   {{ MANIFEST_KEY_FOR_UNOFFICIAL_BUILD }}
   "name": "__MSG_PRODUCT_NAME__",
   "version": "{{ FULL_APP_VERSION }}",
   "description": "__MSG_PRODUCT_DESCRIPTION__",
   "manifest_version": 2,
   "default_locale": "en",
   "minimum_chrome_version": "32",
   "app": {
 {% if webapp_type == 'v1' %}
     "launch": {
       "local_path": "main.html"
     }
 {% else %}
     "background": {
-      "scripts": ["background.js"]
-     }
+      "page": "background.html"
+    }
 {% endif %}
   },
+{% if webapp_type == 'v1' %}
+  "background": {
+    "page": "background.html",
+    "persistent": false
+  },
+{% endif %}
   "icons": {
     "128": "chromoting128.webp",
     "48": "chromoting48.webp",
     "16": "chromoting16.webp"
   },
 {% if webapp_type == 'v1' %}
   "content_scripts": [
     {
       "matches": [
         "{{ OAUTH2_REDIRECT_URL }}"
@@ skipping 18 matching lines @@
     "client_id": "{{ REMOTING_IDENTITY_API_CLIENT_ID }}",
     "scopes": [
       "https://www.googleapis.com/auth/chromoting https://www.googleapis.com/auth/googletalk https://www.googleapis.com/auth/userinfo#email"
     ]
   },
   "sandbox": {
     "pages": [ "wcs_sandbox.html" ]
   },
 {% endif %}
 
+  "externally_connectable": {
+    "matches": [
+        "https://*.talkgadget.google.com/*"
+    ]
+  },
+
   "permissions": [
     "{{ OAUTH2_ACCOUNTS_HOST }}/*",
     "{{ OAUTH2_API_BASE_URL }}/*",
     "{{ DIRECTORY_API_BASE_URL }}/*",
     "{{ TALK_GADGET_HOST }}/talkgadget/*",
     "https://relay.google.com/*",
     "storage",
     "clipboardRead",
     "clipboardWrite",
     "nativeMessaging"
@@ skipping 12 matching lines @@
         "udp-send-to",
         "udp-bind",
         "udp-multicast-membership",
         "resolve-host",
         "network-state"
       ]
     }
 {% endif %}
   ]
 }