[DevTools] Initial implementation of device modes.

Source/devtools/front_end/emulation/OverridesView.js

 /*
  * Copyright (C) 2014 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 20 matching lines @@
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  */
 WebInspector.OverridesView = function()
 {
     WebInspector.VBox.call(this);
     this.setMinimumSize(0, 30);
     this.registerRequiredCSS("emulation/overrides.css");
     this.element.classList.add("overrides-view");
+    if (Runtime.experiments.isEnabled("deviceArt"))
+        this.element.classList.add("device-art");
 
     this._tabbedPane = new WebInspector.TabbedPane();
     this._tabbedPane.setShrinkableTabs(false);
     this._tabbedPane.setVerticalTabLayout(true);
 
     new WebInspector.OverridesView.DeviceTab().appendAsTab(this._tabbedPane);
     new WebInspector.OverridesView.MediaTab().appendAsTab(this._tabbedPane);
     new WebInspector.OverridesView.NetworkTab().appendAsTab(this._tabbedPane);
     new WebInspector.OverridesView.SensorsTab().appendAsTab(this._tabbedPane);
 
@@ skipping 585 matching lines @@
      * @override
      * @param {!Object} overridesSupport
      * @return {!Promise}
      */
     reveal: function(overridesSupport)
     {
         WebInspector.inspectorView.showViewInDrawer("emulation");
         return Promise.resolve();
     }
 }