Add cr_policy_indicator for settings controls

chrome/common/extensions/api/settings_private.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.settingsPrivate</code> API to get or set preferences
 // from the settings UI.
 namespace settingsPrivate {
   // Type of a pref.
   enum PrefType { BOOLEAN, NUMBER, STRING, URL, LIST };
 
-  // Policy source of a pref.
-  enum PolicySource { DEVICE, USER };
+  // Source of a restricted pref, either by policy or other source.
+  enum PolicySource {
+    DEVICE_POLICY,
+    USER_POLICY,
+    OWNER,
+    PRIMARY_USER,
+    EXTENSION
+  };
 
-  // Policy enforcement of a pref.
+  // Enforcement type of a restricted pref.
   enum PolicyEnforcement { ENFORCED, RECOMMENDED };
 
   dictionary PrefObject {
     // The key for the pref.
     DOMString key;
 
     // The type of the pref (e.g., boolean, string, etc.).
     PrefType type;
 
     // The current value of the pref.
     any value;
 
     // The policy source of the pref; an undefined value means there is no
     // policy.
     PolicySource? policySource;
 
     // The policy enforcement of the pref; must be specified if policySource is
     // also present.
     PolicyEnforcement? policyEnforcement;
+
+    // The recommended value if policyEnforcement == RECOMMENDED.
+    any? recommendedValue;
+
+    // The extension ID if policySource == EXTENSION.
+    DOMString? extensionId;
+
+    // True if the pref is not controlled by a policy or user, but it can not be
+    // modified (pref->IsUserModifiable() is false). Defaults to false.
+    boolean? readOnly;
   };
 
   callback OnPrefSetCallback = void (boolean success);
   callback GetAllPrefsCallback = void (PrefObject[] prefs);
   callback GetPrefCallback = void (PrefObject pref);
 
   interface Functions {
     // Sets a settings value.
     // |name|: The name of the pref.
     // |value|: The new value of the pref.
     // |pageId|: The user metrics identifier or null.
     // |callback|: The callback for whether the pref was set or not.
     static void setPref(DOMString name, any value,
         DOMString pageId, OnPrefSetCallback callback);
 
     // Gets an array of all the prefs.
     static void getAllPrefs(GetAllPrefsCallback callback);
 
     // Gets the value of a specific pref.
     static void getPref(DOMString name, GetPrefCallback callback);
   };
 
   interface Events {
     // Fired when a set of prefs has changed.
     //
     // |prefs| The prefs that changed.
     static void onPrefsChanged(PrefObject[] prefs);
   };
 };