Make extensions developer mode adhere to policy

chrome/common/extensions/api/developer_private.idl

 // 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.
 
 // developerPrivate API.
 // This is a private API exposing developing and debugging functionalities for
 // apps and extensions.
 namespace developerPrivate {
 
   // DEPRECATED: Prefer ExtensionType.
@@ skipping 208 matching lines @@
     DOMString updateUrl;
     boolean userMayModify;
     DOMString version;
     ExtensionView[] views;
   };
 
   dictionary ProfileInfo {
     boolean appInfoDialogEnabled;
     boolean canLoadUnpacked;
     boolean inDeveloperMode;
+    boolean isDeveloperModeControlledByPolicy;
     boolean isIncognitoAvailable;
     boolean isSupervised;
   };
 
   // DEPRECATED: Prefer ExtensionInfo.
   dictionary ItemInfo {
     DOMString id;
     DOMString name;
     DOMString version;
     DOMString description;
@@ skipping 351 matching lines @@
 
   interface Events {
     // Fired when a item state is changed.
     static void onItemStateChanged(EventData response);
 
     // Fired when the profile's state has changed.
     static void onProfileStateChanged(ProfileInfo info);
   };
 
 };