[ios] Adds a CommandDispatcher to Browser.

ios/clean/chrome/browser/model/browser.h

Index: ios/clean/chrome/browser/model/browser.h
diff --git a/ios/clean/chrome/browser/model/browser.h b/ios/clean/chrome/browser/model/browser.h
index 18abdd58d184c3888c97e2c187c1813bf95e6684..fb76c0d826350a84223af1e737b760b77c19e14d 100644
--- a/ios/clean/chrome/browser/model/browser.h
+++ b/ios/clean/chrome/browser/model/browser.h
@@ -12,6 +12,8 @@
 class WebStateList;
 class WebStateListDelegate;
 
+@class CommandDispatcher;
+
 namespace ios {
 class ChromeBrowserState;
 }
@@ -26,9 +28,12 @@ class 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_;
   ios::ChromeBrowserState* browser_state_;
   std::unique_ptr<WebStateListDelegate> web_state_list_delegate_;
   std::unique_ptr<WebStateList> web_state_list_;