DevTools: introduce screencast experiment.

Source/devtools/front_end/inspector.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 568 matching lines @@
         PageAgent.setShowViewportSizeOnResize(true, WebInspector.settings.showMetricsRulers.get());
     }
     showRulersChanged();
 
     WebInspector.WorkerManager.loadCompleted();
     InspectorFrontendAPI.loadCompleted();
 
     if (WebInspector.experimentsSettings.tethering.isEnabled())
         this._setupTethering();
 
+    if (WebInspector.experimentsSettings.screencast.isEnabled()) {
+        var splitView = new WebInspector.SplitView(true, "screencastSplitView");
+        splitView.markAsRoot();
+        splitView.setSecondIsSidebar(false);
+        splitView.show(document.body);
+
+        var screencastView = new WebInspector.ScreencastView();
+        screencastView.show(splitView.firstElement());
+        splitView.secondElement().appendChild(document.getElementById("root"));
+    }
+
     WebInspector.notifications.dispatchEventToListeners(WebInspector.Events.InspectorLoaded);
 }
 
 var windowLoaded = function()
 {
     WebInspector.loaded();
     window.removeEventListener("DOMContentLoaded", windowLoaded, false);
     delete windowLoaded;
 };
 
@@ skipping 511 matching lines @@
 
 /**
  * @return {string}
  */
 WebInspector.getSelectionForegroundColor = function()
 {
     return InspectorFrontendHost.getSelectionForegroundColor();
 }
 
 window.DEBUG = true;