Surface lock icon explanations in the DevTools Security panel.

Source/devtools/front_end/security/SecurityModel.js

 // 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.
 
 /**
  * @constructor
  * @extends {WebInspector.SDKModel}
  * @param {!WebInspector.Target} target
  */
 WebInspector.SecurityModel = function(target)
 {
     WebInspector.SDKModel.call(this, WebInspector.SecurityModel, target);
     this._dispatcher = new WebInspector.SecurityDispatcher(this);
     this._securityAgent = target.securityAgent();
     target.registerSecurityDispatcher(this._dispatcher);
     this._securityAgent.enable();
 
-    this._securityState = "unknown";
+    this._securityState = SecurityAgent.SecurityState.Unknown;
 }
 
 WebInspector.SecurityModel.EventTypes = {
     SecurityStateChanged: "SecurityStateChanged"
 }
 
 WebInspector.SecurityModel.prototype = {
     /**
      * @return {!SecurityAgent.SecurityState} securityState
      */
@@ skipping 23 matching lines @@
  */
 WebInspector.SecurityDispatcher = function(model)
 {
     this._model = model;
 }
 
 WebInspector.SecurityDispatcher.prototype = {
     /**
      * @override
      * @param {!SecurityAgent.SecurityState} securityState
+     * @param {!Array<!SecurityAgent.SecurityStateExplanation>=} explanations
      */
-    securityStateChanged: function(securityState)
+    securityStateChanged: function(securityState, explanations)
     {
-        this._model._securityState = securityState;
-        this._model.dispatchEventToListeners(WebInspector.SecurityModel.EventTypes.SecurityStateChanged, securityState);
+        var data = {"securityState": securityState, "explanations": explanations || []};
+        this._model.dispatchEventToListeners(WebInspector.SecurityModel.EventTypes.SecurityStateChanged, data);
     }
 }