Do not submit: high level overview patch.

chrome/browser/ui/android/tab_model/tab_model.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_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_
 #define CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sessions/session_id.h"
+#include "chrome/browser/sync/glue/synced_tab_delegate.h"
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
 #include "chrome/browser/ui/toolbar/toolbar_model_delegate.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 namespace browser_sync {
 class SyncedWindowDelegate;
 class SyncedWindowDelegateAndroid;
+class SyncedTabDelegate;
 }
 
 namespace content {
 class WebContents;
 }
 
 class Profile;
 
 // Abstract representation of a Tab Model for Android.  Since Android does
 // not use Browser/BrowserList, this is required to allow Chrome to interact
 // with Android's Tabs and Tab Model.
 class TabModel : public content::NotificationObserver,
                  public ToolbarModelDelegate {
  public:
   explicit TabModel(Profile* profile);
   // Deprecated: This constructor is deprecated and should be removed once
   // downstream Android uses new constructor. See crbug.com/159704.
   TabModel();
   virtual ~TabModel();
 
   // Implementation of ToolbarDelegate
   virtual content::WebContents* GetActiveWebContents() const OVERRIDE;
 
   virtual Profile* GetProfile() const;
   virtual bool IsOffTheRecord() const;
   virtual browser_sync::SyncedWindowDelegate* GetSyncedWindowDelegate() const;
   virtual SessionID::id_type GetSessionId() const;
-
   virtual int GetTabCount() const = 0;
   virtual int GetActiveIndex() const = 0;
   virtual content::WebContents* GetWebContentsAt(int index) const = 0;
-  virtual SessionID::id_type GetTabIdAt(int index) const = 0;
+  virtual browser_sync::SyncedTabDelegate* GetTabAt(int index) const = 0;
 
   // Used for restoring tabs from synced foreign sessions.
   virtual void CreateTab(content::WebContents* web_contents) = 0;
 
   // Return true if we are currently restoring sessions asynchronously.
   virtual bool IsSessionRestoreInProgress() const = 0;
 
   virtual void OpenClearBrowsingData() const = 0;
 
   ToolbarModel::SecurityLevel GetSecurityLevelForCurrentTab();
@@ skipping 37 matching lines @@
   // across sessions.
   SessionID session_id_;
 
   // The Registrar used to register TabModel for notifications.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TabModel);
 };
 
 #endif  // CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_