Implement InstanceID API functions.

chrome/common/extensions/api/instance_id.idl

 // Copyright 2015 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.
 
 // Use the <code>chrome.instanceID</code> API to access the InstanceID service.
 namespace instanceID {
   // Parameters for getToken.
   dictionary GetTokenParams {
     // Identifies the entity that is authorized to access resources associated
     // with this Instance ID. It can be another Instance ID or a project ID.
@@ skipping 15 matching lines @@
 
     // The scope that is passed for obtaining a token.
     DOMString scope;
   };
 
   // |instanceID| : The Instance ID assigned to the app.
   callback GetIDCallback = void(DOMString instanceID);
 
   // |creationTime| : The time when the Instance ID has been generated,
   //     represented in milliseconds since the epoch.
-  callback GetCreationTimeCallback = void(long creationTime);
+  callback GetCreationTimeCallback = void(double creationTime);
 
   // |token| : The token assigned by the requested service.
   callback GetTokenCallback = void(DOMString token);
 
   callback DeleteIDCallback = void();
 
   callback DeleteTokenCallback = void();
 
   interface Functions {
     // Retrieves an identifier for the app instance. The instance ID will be
@@ skipping 33 matching lines @@
     static void deleteID(DeleteIDCallback callback);
   };
 
   interface Events {
     // Fired when all the granted tokens need to be refreshed. The Instance ID
     // also needs to be refreshed when updateID is set to true.
     // |updateID| : Instance ID also needs to be refreshed.
     static void onTokenRefresh(boolean updateID);
   };
 };