Adds syncedNotificationsPrivate API IDL.

chrome/common/extensions/api/_permission_features.json

Index: chrome/common/extensions/api/_permission_features.json
diff --git a/chrome/common/extensions/api/_permission_features.json b/chrome/common/extensions/api/_permission_features.json
index 52b45ac1112213055c25a2e51fa5dcfa9ab3b2c0..4547ed5cd45db3c1b66a2eb27f06958e3323164c 100644
--- a/chrome/common/extensions/api/_permission_features.json
+++ b/chrome/common/extensions/api/_permission_features.json
@@ -823,6 +823,10 @@
     "channel": "stable",
     "extension_types": ["platform_app"]
   },
+  "syncedNotificationsPrivate": {
+    "channel": "dev",

[not at google - send to devlin, 2014/05/02 21:37:38]

restrict unimplemented APIs to trunk not dev

[dewittj, 2014/05/03 00:07:49]

Done.

+    "extension_types": ["platform_app"]

[not at google - send to devlin, 2014/05/02 21:37:38]

you will need a whitelist for this eventually? could you artificially restrict
it to component extensions for now, then write your tests against that?

[dewittj, 2014/05/03 00:07:49]

I would rather not have a whitelist so we can hack on it more freely but if you
think that's necessary I could create a web store id etc.  Is it ok to be open
on trunk temporarily?

[not at google - send to devlin, 2014/05/03 00:13:59]

Open on trunk is fine. Damage there seems very limited. Add a comment though :)

+  },
   "systemIndicator": {
     "channel": "dev",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"]