Add hook for extension to check sync status.

chrome/common/extensions/api/preferences_private.json

Index: chrome/common/extensions/api/preferences_private.json
diff --git a/chrome/common/extensions/api/preferences_private.json b/chrome/common/extensions/api/preferences_private.json
index 4ceeb5fafe3b011aeb4f0658da0b6b3f70b4bd66..b6830d9677e42db4360f8508b8943ba0ac7e3201 100644
--- a/chrome/common/extensions/api/preferences_private.json
+++ b/chrome/common/extensions/api/preferences_private.json
@@ -8,10 +8,31 @@
     "description": "none",
     "properties": {
       "googleGeolocationAccessEnabled": {
+        "nocompile": true,
         "$ref": "types.private.ChromeDirectSetting",
         "value": ["googlegeolocationaccess.enabled", {"type":"boolean"}],
         "description": "If enabled, Google services can access the user's location. This preference's value is a boolean, defaulting to <code>false</code>."
       }
-    }
+    },
+    "functions": [
+      {
+        "name": "getSyncCategoriesWithoutPassphrase",
+        "description": "Returns a list of sync categories the user has enabled without using a custom passphrase for encryption",

[Jeffrey Yasskin, 2013/12/19 23:47:24]

Please document the list of possible category strings here, or say where in the
source the list is defined. These files are where we need to be able to look to
learn the contract for any new API.

+        "type": "function",
+        "parameters": [
+          {
+            "name": "callback",
+            "type": "function",
+            "parameters": [
+              {
+                "name": "categories",
+                "type": "array",
+                "items": {"type": "string"}
+              }
+            ]
+          }
+        ]
+      }
+    ]
   }
 ]