[DevTools] Make resource tree model optional

third_party/WebKit/Source/devtools/front_end/screencast/ScreencastView.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 79 matching lines @@
         this._titleElement.style.left = "0";
 
         this._imageElement = new Image();
         this._isCasting = false;
         this._context = this._canvasElement.getContext("2d");
         this._checkerboardPattern = this._createCheckerboardPattern(this._context);
 
         this._shortcuts = /** !Object.<number, function(Event=):boolean> */ ({});
         this._shortcuts[WebInspector.KeyboardShortcut.makeKey("l", WebInspector.KeyboardShortcut.Modifiers.Ctrl)] = this._focusNavigationBar.bind(this);
 
-        this._target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.ScreencastFrame, this._screencastFrame, this);
-        this._target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.ScreencastVisibilityChanged, this._screencastVisibilityChanged, this);
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._target);

[dgozman, 2016/07/14 16:29:29]

ditto

[eostroukhov-old, 2016/07/20 23:46:15]

Done.

+        if (resourceTreeModel) {
+            resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.ScreencastFrame, this._screencastFrame, this);
+            resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.ScreencastVisibilityChanged, this._screencastVisibilityChanged, this);
+        }
 
         WebInspector.targetManager.addEventListener(WebInspector.TargetManager.Events.SuspendStateChanged, this._onSuspendStateChange, this);
         this._updateGlasspane();
     },
 
     wasShown: function()
     {
         this._startCasting();
     },
 
@@ skipping 622 matching lines @@
     {
         var newIndex = this._historyIndex + offset;
         if (newIndex < 0 || newIndex >= this._historyEntries.length)
             return;
         this._target.pageAgent().navigateToHistoryEntry(this._historyEntries[newIndex].id);
         this._requestNavigationHistory();
     },
 
     _navigateReload: function()
     {
-        this._target.resourceTreeModel.reloadPage();
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._target);
+        if (resourceTreeModel)
+            resourceTreeModel.reloadPage();
     },
 
     _navigationUrlKeyUp: function(event)
     {
         if (event.key !== "Enter")
             return;
         var url = this._navigationUrl.value;
         if (!url)
             return;
         if (!url.match(WebInspector.ScreencastView._SchemeRegex))
@@ skipping 108 matching lines @@
             return;
         this._maxDisplayedProgress = progress;
         this._displayProgress(progress);
     },
 
     _displayProgress: function(progress)
     {
         this._element.style.width = (100 * progress) + "%";
     }
 };