Componentize sad_tab

chrome/browser/ui/sad_tab_helper.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 "chrome/browser/ui/sad_tab_helper.h"
-
-#include "base/logging.h"
-#include "chrome/browser/browser_shutdown.h"
-#include "chrome/browser/ui/sad_tab.h"
-#include "content/public/browser/web_contents.h"
-
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(SadTabHelper);
-
-SadTabHelper::~SadTabHelper() {
-}
-
-SadTabHelper::SadTabHelper(content::WebContents* web_contents)
-    : content::WebContentsObserver(web_contents) {
-}
-
-void SadTabHelper::RenderViewReady() {
-  if (sad_tab_) {
-    sad_tab_->Close();
-    sad_tab_.reset();
-  }
-}
-
-void SadTabHelper::RenderProcessGone(base::TerminationStatus status) {
-  // Only show the sad tab if we're not in browser shutdown, so that WebContents
-  // objects that are not in a browser (e.g., HTML dialogs) and thus are
-  // visible do not flash a sad tab page.
-  if (browser_shutdown::GetShutdownType() != browser_shutdown::NOT_VALID)
-    return;
-
-  if (sad_tab_)
-    return;
-
-  if (chrome::SadTab::ShouldShow(status))
-    InstallSadTab(status);
-}
-
-void SadTabHelper::InstallSadTab(base::TerminationStatus status) {
-  chrome::SadTabKind kind =
-      (status == base::TERMINATION_STATUS_PROCESS_WAS_KILLED) ?
-          chrome::SAD_TAB_KIND_KILLED : chrome::SAD_TAB_KIND_CRASHED;
-  sad_tab_.reset(chrome::SadTab::Create(web_contents(), kind));
-  sad_tab_->Show();
-}