Disable/enable echo for enterprise device.

chrome/common/extensions/api/echo_private.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "echoPrivate",
     "nodoc": true,
     "platforms": ["chromeos"],
     "types": [],
@@ skipping 31 matching lines @@
             "type": "function",
             "parameters": [
               {
                 "name": "result",
                 "type": "string",
                 "description" : "The OOBE timestamp."
               }
             ]
           }
         ]
+      },
+      {
+        "name": "checkAllowRedeemOffers",
+        "description": "Check if device policy allows users to redeem offers.",
+        "type": "function",
+        "parameters": [
+          {
+            "name": "callback",
+            "type": "function",
+            "parameters": [
+              {
+                "name": "result",
+                "type": "boolean",
+                "description" : "true if allowed to redeem offers."
+              }
+            ]
+          }
+        ]
       }
     ]
   }
 ]