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

ash/screensaver/screensaver_view.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 ASH_SCREENSAVER_SCREENSAVER_VIEW_H_
+#define ASH_SCREENSAVER_SCREENSAVER_VIEW_H_
+#pragma once
+
+#include "ash/ash_export.h"
+#include "base/callback.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "googleurl/src/gurl.h"
+#include "ui/views/widget/widget_delegate.h"
+
+namespace content {
+class BrowserContent;
+}
+
+namespace views {
+class WebView;
+}
+
+namespace ash {
+
+namespace test {
+class ScreensaverViewTest;
+}
+
+ASH_EXPORT void ShowScreensaver(const GURL& url);
+ASH_EXPORT void CloseScreensaver();
+
+typedef
+    base::Callback<views::WebView*(content::BrowserContext*)> WebViewFactory;
+
+namespace internal {
+
+// Shows a URL as a screensaver. The screensaver window is fullscreen,
+// always on top of every other window and will reload the URL if the
+// renderer crashes for any reason.
+class ScreensaverView : public views::WidgetDelegateView,
+                        public content::WebContentsObserver {
+ public:
+  static void ShowScreensaver(const GURL& url);
+  static void CloseScreensaver();
+
+ private:
+  friend class test::ScreensaverViewTest;
+
+  explicit ScreensaverView(const GURL& url);
+  virtual ~ScreensaverView();
+
+  // views::WidgetDelegate overrides.
+  virtual views::View* GetContentsView() OVERRIDE;
+
+  // content::WebContentsObserver overrides.
+  virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
+
+  void Show();
+  void Close();
+
+  // Creates and adds web contents to our view.
+  void AddChildWebContents();
+  // Load the screensaver in the WebView's webcontent. If the webcontents
+  // don't exist, they'll be created by WebView.
+  void LoadScreensaver();
+  // Creates and shows a frameless full screen window containing our view.
+  void ShowWindow();
+
+  // For testing purposes.
+  static ASH_EXPORT ScreensaverView* GetInstance();
+
+  // URL to show in the screensaver.
+  GURL url_;
+
+  // Host for the extension that implements this dialog.
+  views::WebView* screensaver_webview_;
+
+  // Window that holds the screensaver webview.
+  views::Widget* container_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreensaverView);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SCREENSAVER_SCREENSAVER_VIEW_H_