Do not submit: high level overview patch.

chrome/browser/sessions/base_session_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_SESSIONS_BASE_SESSION_SERVICE_H_
 #define CHROME_BROWSER_SESSIONS_BASE_SESSION_SERVICE_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
@@ skipping 95 matching lines @@
       SessionID::id_type command_id,
       SessionID::id_type tab_id,
       const std::string& user_agent_override);
 
   // Creates a SessionCommand stores a browser window's app name.
   SessionCommand* CreateSetWindowAppNameCommand(
       SessionID::id_type command_id,
       SessionID::id_type window_id,
       const std::string& app_name);
 
+  SessionCommand* CreateSetTabSessionSyncIdCommand(
+      SessionID::id_type command_id,
+      SessionID::id_type tab_id,
+      const int64& sync_id);
+
   // Converts a SessionCommand previously created by
   // CreateUpdateTabNavigationCommand into a
   // sessions::SerializedNavigationEntry. Returns true on success. If
   // successful |tab_id| is set to the id of the restored tab.
   bool RestoreUpdateTabNavigationCommand(
       const SessionCommand& command,
       sessions::SerializedNavigationEntry* navigation,
       SessionID::id_type* tab_id);
 
   // Extracts a SessionCommand as previously created by
@@ skipping 11 matching lines @@
       SessionID::id_type* tab_id,
       std::string* user_agent_override);
 
   // Extracts a SessionCommand as previously created by
   // CreateSetWindowAppNameCommand into the window id and application name.
   bool RestoreSetWindowAppNameCommand(
       const SessionCommand& command,
       SessionID::id_type* window_id,
       std::string* app_name);
 
+  bool RestoreSetTabSessionSyncIdCommand(const SessionCommand& command,
+                                         SessionID::id_type* tab_id,
+                                         int64* sync_id);
+
   // Returns true if the entry at specified |url| should be written to disk.
   bool ShouldTrackEntry(const GURL& url);
 
   // Invokes SessionBackend::ReadLastSessionCommands with callback on the
   // backend thread.
   // If testing, SessionBackend::ReadLastSessionCommands is invoked directly.
   CancelableTaskTracker::TaskId ScheduleGetLastSessionCommands(
       const InternalGetCommandsCallback& callback,
       CancelableTaskTracker* tracker);
 
@@ skipping 29 matching lines @@
   // over the commands.
   bool pending_reset_;
 
   // The number of commands sent to the backend before doing a reset.
   int commands_since_reset_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseSessionService);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_BASE_SESSION_SERVICE_H_