[Sync] Add support for identifying tabbed activites

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 <memory>
 
 #include "base/macros.h"
@@ skipping 48 matching lines @@
                          int parent_tab_id) = 0;
 
   // Used by Developer Tools to create a new tab with a given URL.
   // Replaces CreateTabForTesting.
   virtual content::WebContents* CreateNewTabForDevTools(const GURL& url) = 0;
 
   // Return true if we are currently restoring sessions asynchronously.
   virtual bool IsSessionRestoreInProgress() const = 0;
 
  protected:
-  explicit TabModel(Profile* profile);
+  explicit TabModel(Profile* profile, bool is_tabbed_activity);
   ~TabModel() override;
 
   // Instructs the TabModel to broadcast a notification that all tabs are now
   // loaded from storage.
   void BroadcastSessionRestoreComplete();
 
   ToolbarModel* GetToolbarModel();
 
  private:
   // Determines how TabModel will interact with the profile.
@@ skipping 20 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_