Remove history dependency from content.

chrome/browser/history/history_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_HISTORY_HISTORY_TAB_HELPER_H_
+#define CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_
+#pragma once
+
+#include "content/browser/tab_contents/tab_contents_observer.h"
+#include "content/common/notification_observer.h"
+#include "content/common/notification_registrar.h"
+
+class HistoryService;
+class SkBitmap;
+struct ThumbnailScore;
+
+namespace history {
+class HistoryAddPageArgs;
+}
+
+class HistoryTabHelper : public TabContentsObserver,
+                         public NotificationObserver {
+ public:
+  explicit HistoryTabHelper(TabContents* tab_contents);
+  ~HistoryTabHelper();
+
+  // Updates history with the specified navigation. This is called by
+  // OnMsgNavigate to update history state.
+  void UpdateHistoryForNavigation(
+      scoped_refptr<history::HistoryAddPageArgs> add_page_args);
+
+  // Sends the page title to the history service. This is called when we receive
+  // the page title and we know we want to update history.
+  void UpdateHistoryPageTitle(const NavigationEntry& entry);
+
+  // Returns the history::HistoryAddPageArgs to use for adding a page to
+  // history.
+  scoped_refptr<history::HistoryAddPageArgs> CreateHistoryAddPageArgs(
+      const GURL& virtual_url,
+      const NavigationController::LoadCommittedDetails& details,
+      const ViewHostMsg_FrameNavigate_Params& params);
+
+ private:
+  // TabContentsObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message);
+  virtual void DidNavigateMainFramePostCommit(
+      const NavigationController::LoadCommittedDetails& details,
+      const ViewHostMsg_FrameNavigate_Params& params);
+  virtual void DidNavigateAnyFramePostCommit(
+      const NavigationController::LoadCommittedDetails& details,
+      const ViewHostMsg_FrameNavigate_Params& params);
+
+  // NotificationObserver implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  void OnPageContents(const GURL& url,
+                      int32 page_id,
+                      const string16& contents);
+  void OnThumbnail(const GURL& url,
+                   const ThumbnailScore& score,
+                   const SkBitmap& bitmap);
+
+  // Helper function to return the history service.  May return NULL.
+  HistoryService* GetHistoryService();
+
+  // Whether we have a (non-empty) title for the current page.
+  // Used to prevent subsequent title updates from affecting history. This
+  // prevents some weirdness because some AJAXy apps use titles for status
+  // messages.
+  bool received_page_title_;
+
+  NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(HistoryTabHelper);
+};
+
+#endif  // CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_