Do not submit: high level overview patch.

chrome/browser/sessions/base_session_service.cc

 // 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.
 
 #include "chrome/browser/sessions/base_session_service.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/pickle.h"
 #include "base/stl_util.h"
@@ skipping 201 matching lines @@
   static const SessionCommand::size_type max_id_size =
       std::numeric_limits<SessionCommand::size_type>::max() - 1024;
 
   int bytes_written = 0;
 
   WriteStringToPickle(pickle, &bytes_written, max_id_size, app_name);
 
   return new SessionCommand(command_id, pickle);
 }
 
+SessionCommand* BaseSessionService::CreateSetTabSessionSyncIdCommand(
+    SessionID::id_type command_id,
+    SessionID::id_type tab_id,
+    const int64& sync_id) {
+  // Use pickle to handle marshalling.
+  Pickle pickle;
+  pickle.WriteInt(tab_id);
+  pickle.WriteInt64(sync_id);
+
+  return new SessionCommand(command_id, pickle);
+}
+
 bool BaseSessionService::RestoreUpdateTabNavigationCommand(
     const SessionCommand& command,
     sessions::SerializedNavigationEntry* navigation,
     SessionID::id_type* tab_id) {
   scoped_ptr<Pickle> pickle(command.PayloadAsPickle());
   if (!pickle.get())
     return false;
   PickleIterator iterator(*pickle);
   return
       pickle->ReadInt(&iterator, tab_id) &&
@@ skipping 32 matching lines @@
     std::string* app_name) {
   scoped_ptr<Pickle> pickle(command.PayloadAsPickle());
   if (!pickle.get())
     return false;
 
   PickleIterator iterator(*pickle);
   return pickle->ReadInt(&iterator, window_id) &&
       pickle->ReadString(&iterator, app_name);
 }
 
+bool BaseSessionService::RestoreSetTabSessionSyncIdCommand(
+    const SessionCommand& command,
+    SessionID::id_type* tab_id,
+    int64* sync_id) {
+  scoped_ptr<Pickle> pickle(command.PayloadAsPickle());
+  if (!pickle.get())
+    return false;
+
+  PickleIterator iterator(*pickle);
+  return pickle->ReadInt(&iterator, tab_id) &&
+         pickle->ReadInt64(&iterator, sync_id);
+}
+
 bool BaseSessionService::ShouldTrackEntry(const GURL& url) {
   return url.is_valid();
 }
 
 CancelableTaskTracker::TaskId
     BaseSessionService::ScheduleGetLastSessionCommands(
     const InternalGetCommandsCallback& callback,
     CancelableTaskTracker* tracker) {
   CancelableTaskTracker::IsCanceledCallback is_canceled;
   CancelableTaskTracker::TaskId id = tracker->NewTrackedTaskId(&is_canceled);
@@ skipping 22 matching lines @@
     // has gone away (around shutdown time) or if we're running as
     // part of a unit test that does not set profile_.
     task.Run();
     return true;
   }
 }
 
 bool BaseSessionService::RunningInProduction() const {
   return profile_ && BrowserThread::IsMessageLoopValid(BrowserThread::FILE);
 }