Create CoreTabHelper, move remaining core TCW functionality into it.

chrome/browser/ui/alternate_error_tab_observer.cc

Index: chrome/browser/ui/alternate_error_tab_observer.cc
diff --git a/chrome/browser/ui/alternate_error_tab_observer.cc b/chrome/browser/ui/alternate_error_tab_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0e3f6331d58e4133a425a5a15d8e24567cd4f1b4
--- /dev/null
+++ b/chrome/browser/ui/alternate_error_tab_observer.cc
@@ -0,0 +1,95 @@
+// Copyright (c) 2011 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/alternate_error_tab_observer.h"
+
+#include "chrome/browser/google/google_util.h"
+#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/pref_names.h"
+#include "content/browser/renderer_host/render_view_host.h"
+#include "content/public/browser/notification_service.h"
+
+AlternateErrorPageTabObserver::AlternateErrorPageTabObserver(
+    TabContentsWrapper* wrapper)
+        : TabContentsObserver(wrapper->tab_contents()),
+          wrapper_(wrapper) {
+  PrefService* prefs = wrapper_->profile()->GetPrefs();
+  if (prefs) {
+    pref_change_registrar_.Init(prefs);
+    pref_change_registrar_.Add(prefs::kAlternateErrorPagesEnabled, this);
+  }
+
+  registrar_.Add(this, chrome::NOTIFICATION_GOOGLE_URL_UPDATED,
+                 content::NotificationService::AllSources());
+}
+
+AlternateErrorPageTabObserver::~AlternateErrorPageTabObserver() {
+}
+
+// static
+void AlternateErrorPageTabObserver::RegisterUserPrefs(PrefService* prefs) {
+  prefs->RegisterBooleanPref(prefs::kAlternateErrorPagesEnabled,
+                             true,
+                             PrefService::SYNCABLE_PREF);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// TabContentsObserver overrides
+
+void AlternateErrorPageTabObserver::RenderViewCreated(
+    RenderViewHost* render_view_host) {
+  UpdateAlternateErrorPageURL(render_view_host);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// content::NotificationObserver overrides
+
+void AlternateErrorPageTabObserver::Observe(int type,
+                            const content::NotificationSource& source,
+                            const content::NotificationDetails& details) {
+  switch (type) {
+    case chrome::NOTIFICATION_GOOGLE_URL_UPDATED:
+      UpdateAlternateErrorPageURL(tab_contents()->render_view_host());
+      break;
+    case chrome::NOTIFICATION_PREF_CHANGED: {
+      std::string* pref_name = content::Details<std::string>(details).ptr();
+      DCHECK(content::Source<PrefService>(source).ptr() ==
+             wrapper_->profile()->GetPrefs());
+      if (*pref_name == prefs::kAlternateErrorPagesEnabled) {
+        UpdateAlternateErrorPageURL(tab_contents()->render_view_host());
+      } else {
+        NOTREACHED() << "unexpected pref change notification" << *pref_name;
+      }
+      break;
+    }
+    default:
+      NOTREACHED();
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Internal helpers
+
+GURL AlternateErrorPageTabObserver::GetAlternateErrorPageURL() const {
+  GURL url;
+  // Disable alternate error pages when in Incognito mode.
+  if (wrapper_->profile()->IsOffTheRecord())
+    return url;
+
+  PrefService* prefs = wrapper_->profile()->GetPrefs();
+  if (prefs->GetBoolean(prefs::kAlternateErrorPagesEnabled)) {
+    url = google_util::AppendGoogleLocaleParam(
+        GURL(google_util::kLinkDoctorBaseURL));
+    url = google_util::AppendGoogleTLDParam(url);
+  }
+  return url;
+}
+
+void AlternateErrorPageTabObserver::UpdateAlternateErrorPageURL(
+    RenderViewHost* rvh) {
+  rvh->SetAltErrorPageURL(GetAlternateErrorPageURL());
+}