Move the ReadingListModel in a Mediator

ios/chrome/browser/ui/reading_list/reading_list_mediator.h

Index: ios/chrome/browser/ui/reading_list/reading_list_mediator.h
diff --git a/ios/chrome/browser/ui/reading_list/reading_list_mediator.h b/ios/chrome/browser/ui/reading_list/reading_list_mediator.h
new file mode 100644
index 0000000000000000000000000000000000000000..ba7962b1fc147aeb37e75bdec7cc9e9b5a0aca4b
--- /dev/null
+++ b/ios/chrome/browser/ui/reading_list/reading_list_mediator.h
@@ -0,0 +1,24 @@
+// 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_CHROME_BROWSER_UI_READING_LIST_READING_LIST_MEDIATOR_H_
+#define IOS_CHROME_BROWSER_UI_READING_LIST_READING_LIST_MEDIATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/reading_list/reading_list_data_source.h"
+
+class ReadingListModel;
+
+// Mediator between the Model and the UI.
+@interface ReadingListMediator : NSObject<ReadingListDataSource>
+
+- (nullable instancetype)init NS_UNAVAILABLE;
+
+- (nullable instancetype)initWithModel:(nonnull ReadingListModel*)model
+    NS_DESIGNATED_INITIALIZER;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_READING_LIST_READING_LIST_MEDIATOR_H_