[Sync] Add logic to reassociate tab nodes after restart.

chrome/browser/ui/sync/tab_contents_synced_tab_delegate.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/ui/sync/tab_contents_synced_tab_delegate.h"
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/sync/glue/synced_window_delegate.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
 
 #if defined(ENABLE_MANAGED_USERS)
 #include "chrome/browser/managed_mode/managed_mode_navigation_observer.h"
 #include "chrome/browser/managed_mode/managed_user_service.h"
 #endif
 
 using content::NavigationEntry;
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(TabContentsSyncedTabDelegate);
 
 TabContentsSyncedTabDelegate::TabContentsSyncedTabDelegate(
     content::WebContents* web_contents)
-        : web_contents_(web_contents) {}
+    : web_contents_(web_contents), sync_session_id_(-1) {}
 
 TabContentsSyncedTabDelegate::~TabContentsSyncedTabDelegate() {}
 
 SessionID::id_type TabContentsSyncedTabDelegate::GetWindowId() const {
   return SessionTabHelper::FromWebContents(web_contents_)->window_id().id();
 }
 
 SessionID::id_type TabContentsSyncedTabDelegate::GetSessionId() const {
   return SessionTabHelper::FromWebContents(web_contents_)->session_id().id();
 }
@@ skipping 59 matching lines @@
 
 bool TabContentsSyncedTabDelegate::IsPinned() const {
   const browser_sync::SyncedWindowDelegate* window =
       browser_sync::SyncedWindowDelegate::FindSyncedWindowDelegateWithId(
           GetWindowId());
   // We might not have a parent window, e.g. Developer Tools.
   return window ? window->IsTabPinned(this) : false;
 }
 
 bool TabContentsSyncedTabDelegate::HasWebContents() const { return true; }
+
+int64 TabContentsSyncedTabDelegate::GetSyncId() const {
+  return sync_session_id_;
+}
+
+void TabContentsSyncedTabDelegate::SetSyncId(int64 sync_id) {
+  sync_session_id_ = sync_id;
+}