[Session restore] Add MRU logic to loading of background pages.

components/sessions/base_session_service_commands.h

 // Copyright 2014 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 COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_COMMANDS_H_
 #define COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_COMMANDS_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 25 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.
 SESSIONS_EXPORT scoped_ptr<SessionCommand> CreateSetWindowAppNameCommand(
     SessionID::id_type command_id,
     SessionID::id_type window_id,
     const std::string& app_name);
 
+// Creates a SessionCommand stores the last time the tab was activated.
+SESSIONS_EXPORT scoped_ptr<SessionCommand> CreateLastActiveTimeCommand(

[sky, 2015/05/12 21:25:30]

Is this used?

[Georges Khalil, 2015/05/15 16:55:30]

Not anymore, removed.

+    SessionID::id_type command_id,
+    SessionID::id_type window_id,
+    const std::string& app_name);
+
 // 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.
 SESSIONS_EXPORT bool RestoreUpdateTabNavigationCommand(
     const SessionCommand& command,
     sessions::SerializedNavigationEntry* navigation,
     SessionID::id_type* tab_id);
 
 // Extracts a SessionCommand as previously created by
@@ skipping 14 matching lines @@
 // Extracts a SessionCommand as previously created by
 // CreateSetWindowAppNameCommand into the window id and application name.
 SESSIONS_EXPORT bool RestoreSetWindowAppNameCommand(
     const SessionCommand& command,
     SessionID::id_type* window_id,
     std::string* app_name);
 
 }  // namespace sessions
 
 #endif  // COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_COMMANDS_H_