Create CoreTabHelper, move remaining core TCW functionality into it.

chrome/browser/ui/tab_contents/core_tab_helper.h

+// 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.
+
+#ifndef CHROME_BROWSER_UI_TAB_CONTENTS_CORE_TAB_HELPER_H_
+#define CHROME_BROWSER_UI_TAB_CONTENTS_CORE_TAB_HELPER_H_
+#pragma once
+
+#include "chrome/browser/prefs/pref_change_registrar.h"
+#include "content/browser/tab_contents/tab_contents_observer.h"
+
+class CoreTabHelperDelegate;
+class TabContentsWrapper;
+
+// Per-tab class to handle functionality that is core to the operation of tabs.
+class CoreTabHelper : public TabContentsObserver,
+                      public content::NotificationObserver {
+ public:
+  explicit CoreTabHelper(TabContentsWrapper* wrapper);
+  virtual ~CoreTabHelper();
+
+  CoreTabHelperDelegate* delegate() const { return delegate_; }
+  void set_delegate(CoreTabHelperDelegate* d) { delegate_ = d; }
+
+  // Initial title assigned to NavigationEntries from Navigate.
+  static string16 GetDefaultTitle();
+
+  // Returns a human-readable description the tab's loading state.
+  string16 GetStatusText() const;
+
+ private:
+  // TabContentsObserver overrides:
+  virtual void DidBecomeSelected() OVERRIDE;
+
+  // content::NotificationObserver overrides:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // Delegate for notifying our owner about stuff. Not owned by us.
+  CoreTabHelperDelegate* delegate_;
+
+  // Our owning TabContentsWrapper.
+  TabContentsWrapper* wrapper_;
+
+  PrefChangeRegistrar pref_change_registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(CoreTabHelper);
+};
+
+#endif  // CHROME_BROWSER_UI_TAB_CONTENTS_CORE_TAB_HELPER_H_