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

ash/screensaver/screensaver_view.cc

+// 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.
+
+#include "ash/screensaver/screensaver_view.h"
+
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+#include "base/bind.h"
+#include "base/logging.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "ui/gfx/screen.h"
+#include "ui/aura/root_window.h"
+#include "ui/views/layout/fill_layout.h"
+#include "ui/views/controls/webview/webview.h"
+#include "ui/views/widget/widget.h"
+
+using content::BrowserThread;
+
+namespace {
+
+ash::internal::ScreensaverView* g_instance = NULL;
+
+}  // namespace
+
+namespace ash {
+
+void ShowScreensaver(const GURL& url) {
+  internal::ScreensaverView::ShowScreensaver(url);
+}
+
+void CloseScreensaver() {
+  internal::ScreensaverView::CloseScreensaver();
+}
+
+namespace internal {
+
+// static
+void ScreensaverView::ShowScreensaver(const GURL& url) {
+  if (!g_instance) {
+    g_instance = new ScreensaverView(url);
+    g_instance->Show();
+  }
+}
+
+// static
+void ScreensaverView::CloseScreensaver() {
+  if (g_instance) {
+    g_instance->Close();
+    g_instance = NULL;
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ScreensaverView, views::WidgetDelegateView implementation.
+views::View* ScreensaverView::GetContentsView() {
+  return this;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ScreensaverView, content::WebContentsObserver implementation.
+void ScreensaverView::RenderViewGone(
+    base::TerminationStatus status) {
+  LOG(ERROR) << "Screensaver terminated with status " << status
+             << ", reloading.";
+  // Reload the screensaver url into the webcontents.
+  LoadScreensaver();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ScreensaverView private methods.
+ScreensaverView::ScreensaverView(const GURL& url)
+    : url_(url),
+      screensaver_webview_(NULL),
+      container_window_(NULL) {
+}
+
+ScreensaverView::~ScreensaverView() {
+}
+
+void ScreensaverView::Show() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  // Add the WebView to our view.
+  AddChildWebContents();
+  // Show the window.
+  ShowWindow();
+}
+
+void ScreensaverView::Close() {
+  DCHECK(GetWidget());
+  GetWidget()->Close();
+}
+
+void ScreensaverView::AddChildWebContents() {
+  content::BrowserContext* context =
+      Shell::GetInstance()->delegate()->GetCurrentBrowserContext();
+  screensaver_webview_ = new views::WebView(context);
+  SetLayoutManager(new views::FillLayout);
+  AddChildView(screensaver_webview_);
+
+  LoadScreensaver();
+  content::WebContentsObserver::Observe(
+      screensaver_webview_->GetWebContents());
+}
+
+void ScreensaverView::LoadScreensaver() {
+  screensaver_webview_->GetWebContents()->GetController().LoadURL(
+        url_,
+        content::Referrer(),
+        content::PAGE_TRANSITION_START_PAGE,
+        std::string());
+}
+
+void ScreensaverView::ShowWindow() {
+  aura::RootWindow* root_window = ash::Shell::GetRootWindow();
+  gfx::Rect screen_rect =
+      gfx::Screen::GetMonitorNearestWindow(root_window).bounds();
+
+  // We want to be the fullscreen topmost child of the root window.
+  // There should be nothing ever really that should show up on top of us.
+  container_window_ = new views::Widget();
+  views::Widget::InitParams params(
+      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+  params.delegate = this;
+  params.parent = root_window;
+  container_window_->Init(params);
+
+  container_window_->StackAtTop();
+  container_window_->SetBounds(screen_rect);
+  container_window_->Show();
+}
+
+// static
+ScreensaverView* ScreensaverView::GetInstance() {
+  return g_instance;
+}
+
+}  // namespace internal
+}  // namespace ash