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

chrome/browser/android/tab_android.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_ANDROID_TAB_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_TAB_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/jni_helper.h"
@@ skipping 63 matching lines @@
   // Called to determine if chrome://welcome should contain links to the terms
   // of service and the privacy notice.
   virtual bool ShouldWelcomePageLinkToTermsOfService() = 0;
 
   // Called when the common ExternalProtocolHandler wants to
   // run the external protocol dialog.
   // TODO(jknotten): Remove this method. Making it non-abstract, so that
   // derived classes may remove their implementation first.
   virtual void RunExternalProtocolDialog(const GURL& url);
 
+  // Used by sync to get/set the sync id of tab.
+  virtual int64 GetSyncId() const = 0;
+  virtual void SetSyncId(int64 sync_id) = 0;
+
   static bool RegisterTabAndroid(JNIEnv* env);
+
  protected:
   virtual ~TabAndroid();
 
   static void InitTabHelpers(content::WebContents* web_contents);
 
   content::WebContents* InitWebContentsFromView(JNIEnv* env,
                                                 jobject content_view);
 
   SessionID tab_id_;
 
  private:
   JavaObjectWeakGlobalRef weak_java_tab_;
 };
 
 #endif  // CHROME_BROWSER_ANDROID_TAB_ANDROID_H_