[DevTools] Show viewport size on resize by default, disable in device mode.

third_party/WebKit/Source/devtools/front_end/main/Main.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 1098 matching lines @@
     },
 
     /**
      * @param {!WebInspector.Target} target
      * @override
      */
     targetAdded: function(target)
     {
         target.pageAgent().setAutoAttachToCreatedPages(this._autoAttachSetting.get());
         target.emulationAgent().setScriptExecutionDisabled(this._disableJavascriptSetting.get());
+        target.renderingAgent().setShowViewportSizeOnResize(true);
     },
 
     /**
      * @param {!WebInspector.Target} target
      * @override
      */
     targetRemoved: function(target)
     {
     }
 }
@@ skipping 12 matching lines @@
      * @return {?Element}
      */
     settingElement: function()
     {
         return WebInspector.SettingsUI.createSettingCheckbox(WebInspector.UIString("Show rulers"), WebInspector.moduleSetting("showMetricsRulers"));
     }
 }
 
 
 new WebInspector.Main();