Re-implement the screensaver to use WebView instead of ExtensionDialogHost.

ui/views/views_delegate.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_VIEWS_DELEGATE_H_
 #define UI_VIEWS_VIEWS_DELEGATE_H_
 #pragma once
 
 #include <string>
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "base/string16.h"
 #include "ui/base/accessibility/accessibility_types.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/views/views_export.h"
 
+namespace content {
+class WebContents;
+class BrowserContext;
+class SiteInstance;
+}
+
 namespace gfx {
 class Rect;
 }
 
 namespace ui {
 class Clipboard;
 }
 
 namespace views {
 
@@ skipping 71 matching lines @@
 
   // Converts views::Event::flags to a WindowOpenDisposition.
   virtual int GetDispositionForEvent(int event_flags) = 0;
 
 #if defined(USE_AURA)
   // Creates an object that implements desktop integration behavior. Returned
   // object is owned by the NativeWidgetAura passed in. May return NULL.
   virtual NativeWidgetHelperAura* CreateNativeWidgetHelper(
       NativeWidgetAura* native_widget) = 0;
 #endif
+
+  // Creates a web contents. This will return NULL unless overriden.
+  virtual content::WebContents* CreateWebContents(
+      content::BrowserContext* browser_context,
+      content::SiteInstance* site_instance) = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEWS_DELEGATE_H_