[ios] Adds a CommandDispatcher to Browser.

ios/shared/chrome/browser/ui/browser_list/browser.h

 // Copyright 2017 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 IOS_SHARED_CHROME_BROWSER_UI_BROWSER_LIST_BROWSER_H_
 #define IOS_SHARED_CHROME_BROWSER_UI_BROWSER_LIST_BROWSER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 
 class WebStateList;
 class WebStateListDelegate;
 
+@class CommandDispatcher;
+
 namespace ios {
 class ChromeBrowserState;
 }
 
 // Browser holds the state backing a collection of Tabs and the attached
 // UI elements (Tab strip, ...).
 class Browser {
  public:
   explicit Browser(ios::ChromeBrowserState* browser_state);
   ~Browser();
 
   WebStateList& web_state_list() { return *web_state_list_.get(); }
   const WebStateList& web_state_list() const { return *web_state_list_.get(); }
 
+  CommandDispatcher* dispatcher() { return dispatcher_; }
+
   ios::ChromeBrowserState* browser_state() const { return browser_state_; }
 
  private:
+  __strong CommandDispatcher* dispatcher_;

[sdefresne, 2017/03/24 09:10:19]

We discussed having TabModel getting it's WebStateList from a Browser object in
the old architecture. This means that TabModel will need to know about Browser
(or the class creating the TabModel) which is not yet building with ARC.

I think using base::scoped_nsobject<> here will allow this without requiring
converting TabModel to ARC.

   ios::ChromeBrowserState* browser_state_;
   std::unique_ptr<WebStateListDelegate> web_state_list_delegate_;
   std::unique_ptr<WebStateList> web_state_list_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // IOS_SHARED_CHROME_BROWSER_UI_BROWSER_LIST_BROWSER_H_