[ios clean] Toolbar displays total number of tabs.

ios/clean/chrome/browser/ui/toolbar/toolbar_mediator.h

Index: ios/clean/chrome/browser/ui/toolbar/toolbar_mediator.h
diff --git a/ios/clean/chrome/browser/ui/toolbar/toolbar_mediator.h b/ios/clean/chrome/browser/ui/toolbar/toolbar_mediator.h
index e6059ed6cf68e49a67cb220b9d2cd9e3e5c39fd9..c7c38c259d033ec9e007cac72c9e4c3283fa2759 100644
--- a/ios/clean/chrome/browser/ui/toolbar/toolbar_mediator.h
+++ b/ios/clean/chrome/browser/ui/toolbar/toolbar_mediator.h
@@ -14,6 +14,7 @@
 namespace web {
 class WebState;
 }
+class WebStateList;
 
 // A mediator object that provides the relevant properties of a web state
 // to a consumer.
@@ -23,10 +24,17 @@ class WebState;
 // the lifetime of this object and may be null.
 @property(nonatomic, assign) web::WebState* webState;
 
+// The WebStateList that this mediator listens for any changes on the total
+// number of Webstates.
+@property(nonatomic, assign) WebStateList* webStateList;
+
 // The consumer for this object. This can change during the lifetime of this
 // object and may be nil.
 @property(nonatomic, strong) id<ToolbarConsumer> consumer;
 
+// Stops observing all objects.
+- (void)disconnect;
+
 @end
 
 #endif  // IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MEDIATOR_H_