[ios clean] Creates ToolbarWebState Mediator

ios/clean/chrome/browser/ui/toolbar/toolbar_mediator.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_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MEDIATOR_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MEDIATOR_H_
+
+#import <Foundation/Foundation.h>
+
+@protocol ToolbarConsumer;
+
+namespace web {
+class WebState;
+}
+
+// A mediator object that provides the relevant properties of a web state
+// to a consumer.
+@interface ToolbarMediator : NSObject
+
+// The WebState whose properties this object mediates. This can change during
+// the lifetime of this object and may be null.
+@property(nonatomic, assign) web::WebState* webState;
+
+// The consumer for this object. This can change during the lifetime of this
+// object and may be nil.
+@property(nonatomic, strong) id<ToolbarConsumer> consumer;
+
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MEDIATOR_H_