Add tooltips to cr-policy-indicator

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 };
 
@@ skipping 16 matching lines @@
     // 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 owner name if policySource == OWNER.
+    // The primary user name if policySource == PRIMARY_USER.
+    // The extension name if policySource == EXTENSION.
+    DOMString? policySourceName;
+
     // 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;
 
@@ skipping 22 matching lines @@
     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);
   };
 };