Shortcut ctrl+shift+T added on android.

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"
+#include "chrome/browser/ui/android/tab_model/android_live_tab_context.h"
 #include "components/sessions/core/session_id.h"
 #include "components/sync_sessions/synced_window_delegate.h"
 #include "components/toolbar/toolbar_model.h"
 #include "components/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;
 }
 
 namespace content {
 class WebContents;
 }
 
+namespace sessiosn {
+class LiveTabContext;
+}
+
 class Profile;
 class TabAndroid;
 
 // 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:
   virtual Profile* GetProfile() const;
   virtual bool IsOffTheRecord() const;
   virtual browser_sync::SyncedWindowDelegate* GetSyncedWindowDelegate() const;
   virtual SessionID::id_type GetSessionId() const;
+  virtual const SessionID& SessionId() const;
+  virtual sessions::LiveTabContext* GetLiveTabContext() const;
 
   virtual int GetTabCount() const = 0;
   virtual int GetActiveIndex() const = 0;
   virtual content::WebContents* GetActiveWebContents() const;
   virtual content::WebContents* GetWebContentsAt(int index) const = 0;
   // This will return NULL if the tab has not yet been initialized.
   virtual TabAndroid* GetTabAt(int index) const = 0;
 
   virtual void SetActiveIndex(int index) = 0;
   virtual void CloseTabAt(int index) = 0;
@@ skipping 22 matching lines @@
 
  private:
   // Determines how TabModel will interact with the profile.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   // The profile associated with this TabModel.
   Profile* profile_;
 
+  // The LiveTabContext adapter associated with TabModel.
+  std::unique_ptr<AndroidLiveTabContext> live_tab_context_;

[Theresa, 2016/06/29 23:53:30]

Let's explain what we're using the LiveTabContext for here. It's not obvious
without tracing through the code.

+
   // Describes if this TabModel contains an off-the-record profile.
   bool is_off_the_record_;
 
   // The SyncedWindowDelegate associated with this TabModel.
   std::unique_ptr<browser_sync::SyncedWindowDelegateAndroid>
       synced_window_delegate_;
 
   // Unique identifier of this TabModel for session restore. This id is only
   // unique within the current session, and is not guaranteed to be unique
   // 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_