[DevTools] Update execution context title in select on frame navigation.

Source/devtools/front_end/components/ExecutionContextModel.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
  * @implements {WebInspector.TargetManager.Observer}
  * @param {!Element} selectElement
  */
 WebInspector.ExecutionContextModel = function(selectElement)
 {
     this._selectElement = selectElement;
     /**
      * @type {!Map.<!WebInspector.ExecutionContext, !Element>}
      */
     this._optionByExecutionContext = new Map();
 
     WebInspector.targetManager.observeTargets(this);
     WebInspector.targetManager.addModelListener(WebInspector.RuntimeModel, WebInspector.RuntimeModel.Events.ExecutionContextCreated, this._onExecutionContextCreated, this);
     WebInspector.targetManager.addModelListener(WebInspector.RuntimeModel, WebInspector.RuntimeModel.Events.ExecutionContextDestroyed, this._onExecutionContextDestroyed, this);
+    WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.FrameNavigated, this._onFrameNavigated, this);
 
     this._selectElement.addEventListener("change", this._executionContextChanged.bind(this), false);
     WebInspector.context.addFlavorChangeListener(WebInspector.ExecutionContext, this._executionContextChangedExternally, this);
 }
 
 WebInspector.ExecutionContextModel.prototype = {
     /**
      * @param {!WebInspector.ExecutionContext} executionContext
      * @return {string}
      */
@@ skipping 72 matching lines @@
      */
     _onExecutionContextDestroyed: function(event)
     {
         var executionContext = /** @type {!WebInspector.ExecutionContext} */ (event.data);
         this._executionContextDestroyed(executionContext);
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
+    _onFrameNavigated: function(event)
+    {
+        var frame = /** @type {!WebInspector.ResourceTreeFrame} */ (event.data);
+        var executionContexts = this._optionByExecutionContext.keysArray();
+        for (var i = 0; i < executionContexts.length; ++i) {
+            var context = executionContexts[i];
+            if (context.frameId === frame.id)
+                this._optionByExecutionContext.get(context).text = this._titleFor(context);
+        }
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
     _executionContextChangedExternally: function(event)
     {
         var executionContext =  /** @type {?WebInspector.ExecutionContext} */ (event.data);
         if (!executionContext)
             return;
 
         var options = this._selectElement.options;
         for (var i = 0; i < options.length; ++i) {
             if (options[i].__executionContext === executionContext)
                 this._select(options[i]);
@@ skipping 40 matching lines @@
     /**
      * @return {?Element}
      */
     _selectedOption: function()
     {
         if (this._selectElement.selectedIndex >= 0)
             return this._selectElement[this._selectElement.selectedIndex];
         return null;
     }
 }